We only use Search network, so ads can only get impressions if they are 
triggered by one of the keyword matches.
We use same selector, just different report type.
Why does Keywords Performance Report come back empty?

keyword report request:
<reportDefinition><selector><fields>CustomerDescriptiveName</fields><fields>AdGroupId</fields><fields>CampaignId</fields><fields>AdNetworkType1</fields><fields>Id</fields><fields>QualityScore</fields><fields>KeywordText</fields><predicates><field>AdGroupStatus</field><operator>IN</operator><values>DELETED</values><values>PAUSED</values><values>ENABLED</values></predicates><predicates><field>CampaignStatus</field><operator>IN</operator><values>DELETED</values><values>PAUSED</values><values>ACTIVE</values></predicates><predicates><field>AdNetworkType1</field><operator>IN</operator><values>CONTENT</values><values>SEARCH</values></predicates><predicates><field>Status</field><operator>IN</operator><values>DELETED</values><values>PAUSED</values><values>ACTIVE</values></predicates><dateRange><min>20120201</min><max>20120201</max></dateRange></selector><reportName>Custom
 
Keyword Performance Report 
(CID=5995040476,DateRange=[20120201:20120201])</reportName><reportType>KEYWORDS_PERFORMANCE_REPORT</reportType><dateRangeType>CUSTOM_DATE</dateRangeType><downloadFormat>XML</downloadFormat><includeZeroImpressions>true</includeZeroImpressions></reportDefinition>

keyword report response:
<?xml version='1.0' encoding='UTF-8' standalone='yes'?><report><report-name 
name='Custom Keyword Performance Report 
(CID=5995040476,DateRange=[20120201:20120201])'/><date-range date='Feb 1, 
2012'/><table><columns><column name='clientName' display='Client 
name'/><column name='adGroupID' display='Ad group ID'/><column 
name='campaignID' display='Campaign ID'/><column name='network' 
display='Network'/><column name='keywordID' display='Keyword ID'/><column 
name='qualityScore' display='Quality score'/><column name='keyword' 
display='Keyword'/></columns></table></report>


Ad report request:
<reportDefinition><selector><fields>CustomerDescriptiveName</fields><fields>AdGroupName</fields><fields>AdGroupId</fields><fields>AveragePosition</fields><fields>CampaignName</fields><fields>CampaignId</fields><fields>Clicks</fields><fields>Cost</fields><fields>Impressions</fields><fields>KeywordId</fields><fields>Status</fields><fields>Id</fields><fields>AdNetworkType1</fields><dateRange><min>20120201</min><max>20120201</max></dateRange></selector><reportName>Custom
 
Ad Performance Report 
(CID=5995040476,DateRange=[20120201:20120201])</reportName><reportType>AD_PERFORMANCE_REPORT</reportType><dateRangeType>CUSTOM_DATE</dateRangeType><downloadFormat>XML</downloadFormat><includeZeroImpressions>true</includeZeroImpressions></reportDefinition>

Ad report response:
<?xml version='1.0' encoding='UTF-8' standalone='yes'?><report><report-name 
name='Custom Ad Performance Report 
(CID=5995040476,DateRange=[20120201:20120201])'/><date-range date='Feb 1, 
2012'/><table><columns><column name='clientName' display='Client 
name'/><column name='adGroup' display='Ad group'/><column name='adGroupID' 
display='Ad group ID'/><column name='avgPosition' display='Avg. 
position'/><column name='campaign' display='Campaign'/><column 
name='campaignID' display='Campaign ID'/><column name='clicks' 
display='Clicks'/><column name='cost' display='Cost'/><column 
name='impressions' display='Impressions'/><column name='keywordID' 
display='Keyword ID'/><column name='adState' display='Ad state'/><column 
name='adID' display='Ad ID'/><column name='network' 
display='Network'/></columns><row clientName='#########' 
adGroup='8FB4B561-D203-448E-8199-9D65BDAF11B0_1374_1' 
adGroupID='2124409277' avgPosition='5.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='2' keywordID='141185401' adState='enabled' 
adID='8148205157' network='Search Network'/><row clientName='###########' 
adGroup='8FB4B561-D203-448E-8199-9D65BDAF11B0_1374_1' 
adGroupID='2124409277' avgPosition='4.5' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='4' keywordID='141185401' adState='enabled' 
adID='8148205277' network='Search Network'/><row clientName='#############' 
adGroup='8FB4B561-D203-448E-8199-9D65BDAF11B0_1374_1' 
adGroupID='2124409277' avgPosition='5.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='4' keywordID='141185401' adState='enabled' 
adID='8148204917' network='Search Network'/><row clientName='#########' 
adGroup='8FB4B561-D203-448E-8199-9D65BDAF11B0_1374_1' 
adGroupID='2124409277' avgPosition='1.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='1' keywordID='44249652' adState='enabled' 
adID='8148205037' network='Search Network'/><row 
clientName='###############' 
adGroup='8FB4B561-D203-448E-8199-9D65BDAF11B0_1374_1' 
adGroupID='2124409277' avgPosition='4.25' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='4' keywordID='141185401' adState='enabled' 
adID='8148205037' network='Search Network'/><row clientName='############' 
adGroup='47CBC22F-3AA5-4B2F-9F8C-FFC3757E48CD_10374_1' 
adGroupID='2183913797' avgPosition='3.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPL' campaignID='68769917' 
clicks='0' cost='0' impressions='1' keywordID='119590509' adState='enabled' 
adID='8433819557' network='Search Network'/><row clientName='###########' 
adGroup='47CBC22F-3AA5-4B2F-9F8C-FFC3757E48CD_10373_1' 
adGroupID='2183914037' avgPosition='3.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPL' campaignID='68769917' 
clicks='0' cost='0' impressions='1' keywordID='256459506' adState='enabled' 
adID='8433821357' network='Search Network'/><row clientName='#############' 
adGroup='BCEB0762-F16C-49CB-A2B9-994A18FE069C_1340_1' 
adGroupID='2301031637' avgPosition='4.33' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='3' keywordID='18865603' adState='enabled' 
adID='9055385477' network='Search Network'/><row 
clientName='##############' 
adGroup='7F1BEC2F-316A-4EAC-AE9E-DE4DBF30B801_1943_1' 
adGroupID='2301033437' avgPosition='2.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='1' keywordID='110702676' adState='enabled' 
adID='9055392557' network='Search Network'/><row 
clientName='################' 
adGroup='7F1BEC2F-316A-4EAC-AE9E-DE4DBF30B801_1943_1' 
adGroupID='2301033437' avgPosition='1.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='1' keywordID='34788153' adState='enabled' 
adID='9055392677' network='Search Network'/><row clientName='#############' 
adGroup='7F1BEC2F-316A-4EAC-AE9E-DE4DBF30B801_1943_1' 
adGroupID='2301033437' avgPosition='2.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='3' keywordID='110702676' adState='enabled' 
adID='9055392677' network='Search Network'/><row clientName='############' 
adGroup='7F1BEC2F-316A-4EAC-AE9E-DE4DBF30B801_1943_1' 
adGroupID='2301033437' avgPosition='1.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='1' keywordID='34788153' adState='enabled' 
adID='9055392797' network='Search Network'/><row clientName='#############' 
adGroup='7F1BEC2F-316A-4EAC-AE9E-DE4DBF30B801_1943_1' 
adGroupID='2301033437' avgPosition='2.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='2' keywordID='110702676' adState='enabled' 
adID='9055392917' network='Search Network'/><row 
clientName='###############' 
adGroup='7F1BEC2F-316A-4EAC-AE9E-DE4DBF30B801_1943_1' 
adGroupID='2301033557' avgPosition='2.0' 
campaign='E4F211C9-F450-4B56-B07C-8F33A60B241D-GES' campaignID='67659677' 
clicks='0' cost='0' impressions='2' keywordID='27453558916' 
adState='enabled' adID='9055393277' network='Search Network'/><row 
clientName='################' 
adGroup='BD07651D-DC3D-4F64-9418-04F0FEF26F25_2896_1' 
adGroupID='2301033797' avgPosition='7.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='1' keywordID='165768499' adState='enabled' 
adID='9055393997' network='Search Network'/><row 
clientName='###############' 
adGroup='BD07651D-DC3D-4F64-9418-04F0FEF26F25_2896_1' 
adGroupID='2301033797' avgPosition='5.0' 
campaign='B2233F06-7AB1-4972-A2FA-4E5F2E793C64-IPS' campaignID='67469957' 
clicks='0' cost='0' impressions='1' keywordID='38126681' adState='enabled' 
adID='9055394357' network='Search Network'/><row clientName='#############' 
adGroup='BD07651D-DC3D-4F64-9418-04F0FEF26F25_2896_1' 
adGroupID='2301033917' avgPosition='3.0' 
campaign='E4F211C9-F450-4B56-B07C-8F33A60B241D-GES' campaignID='67659677' 
clicks='0' cost='0' impressions='1' keywordID='32106527717' 
adState='enabled' adID='9055394597' network='Search 
Network'/></table></report>

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Also find us on our blog and discussion group:
http://adwordsapi.blogspot.com
http://groups.google.com/group/adwords-api
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