Thanks a lot, makes More sense now. 

Regards,
Emad

> On 22 Jun 2022, at 12:07 PM, Ingo Wolfmayr <ingo.wolfm...@wolfix.at> wrote:
> 
> Here is an example copied from the InventoryItemDetail entity: 100 income, 2 
> sold
> 
> Inventory Item ID     Inventory Item Detail Seq ID    Effektives Datum        
> Quantity On Hand Diff   Available To Promise Diff       Accounting Quantity 
> Diff        Unit Cost       Order ID        Order Item Seq ID       Ship 
> Group Seq ID       Shipment ID     Shipment Item Seq ID    Return ID       
> Return Item Seq ID      Work Effort ID  Fixed Asset ID  Maint Hist Seq ID     
>   Item Issuance ID        Receipt ID
> 1. 10060      10050   2022-06-21 11:14:59.578         100     100     0       
> 0                                                                             
>                   10030
> 2. 10060      10051   2022-06-21 11:15:00.172         0       0       100     
>                                                                               
>                    
> 3. 10060      10056   2022-06-21 11:39:23.352         0       -1      0       
>         WSWSO10110      00002                                                 
>                            
> 4. 10060      10057   2022-06-21 11:39:24.021         0       -1      0       
>         WSWSO10110      00001                                                 
>                            
> 5. 10060      10059   2022-06-22 12:00:04.719         0       0       -1      
>                                                                               
>                    
> 6. 10060      10060   2022-06-22 12:00:04.415         -1      0       0       
>         WSWSO10110      00001   00001   10035   00001                         
>                   10015    
> 7. 10060      10063   2022-06-22 12:00:04.913         0       0       -1      
>                                                                               
>                    
> 8. 10060      10064   2022-06-22 12:00:04.908         -1      0       0       
>         WSWSO10110      00002   00001   10035   00002                         
>                   10017     
> 
> 1. shows an income of quantity 100. QOH & ATP
> 2. adds the Accounting Quantity - in this case 100
> 3., 4. are the order reservations.
> 5., 6. removing inventory quantity 1 --> shipping - physical stock removed, 
> removed from accounting
> 4., 8. removing inventory quantity 1 --> shipping - physical stock removed, 
> removed from accounting
> 
> Best regards,
> Ingo
> 
> -----Ursprüngliche Nachricht-----
> Von: Emad Radwan <eradwan1...@gmail.com> 
> Gesendet: Mittwoch, 22. Juni 2022 11:35
> An: user@ofbiz.apache.org
> Betreff: Re: Inventory Item Detail
> 
> Hi Ingo,
> 
> In this case, in the new record where we updated the mentioned field with -2, 
> will be an update to the ‘QUANTITY_ON_HAND_DIFF’ field? On the same record I 
> mean, and that’s what confuses me from some of the demo data.
> 
> Regards,
> Emad
> 
>> On 22 Jun 2022, at 7:57 AM, Ingo Wolfmayr <ingo.wolfm...@wolfix.at> wrote:
>> 
>> Hi Emad,
>> 
>> when the initial record is done (for example adding product inventory with 
>> quantity 10 for productId "demoproduc"t) the inventory item gets 
>> +10 QUANTITY_ON_HAND_DIFF
>> +10 AVAILABLE_TO_PROMISE_DIFF’
>> 
>> If a customer creates an order, adding quantity 2 from demoproduct an 
>> inventory item detail with AVAILABLE_TO_PROMISE_DIFF -2 is created. The 
>> inventory is reserved for that order.
>> The result: 
>> ATP: 8  - available to promise
>> QOH: 10 - physical stock
>> 
>> This is just one simple case for inventory change. Does this answer your 
>> question?
>> 
>> Best regards,
>> Ingo
>> 
>> 
>> 
>> -----Ursprüngliche Nachricht-----
>> Von: Emad Radwan <eradwan1...@gmail.com> 
>> Gesendet: Dienstag, 21. Juni 2022 17:11
>> An: user@ofbiz.apache.org
>> Betreff: Inventory Item Detail
>> 
>> Hello Community,
>> 
>> I need your help please understanding the logic used while adding records to 
>> the subject table as demo data is not giving enough insight regarding the 
>> same. Usually, we’ll have one initial record added with every 
>> ‘inventory_item’ and fields ‘QUANTITY_ON_HAND_DIFF’ and 
>> ‘AVAILABLE_TO_PROMISE_DIFF’ have the same value.
>> 
>> My question is how subsequent records on the same inventory item affect the 
>> values of the mentioned fields?
>> 
>> Regards,
>> Emad
> 

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