If by "calling SVC 51" you mean "issuing SNAP(X)", we can continue.  SVC 51 is 
used for multiple purposes.

Use the DCB attributes that are documented or don't bother playing.

<snip>
I am trying to dump a dataspace (that is owned by an other address space)
SNAPX doc says "The system dumps storage from any data space to which the
caller has authority" I interpret this to mean that the ALET is on my DU-AL
</snip>

That is not the right interpretation. You have access to spaces represented by 
entries on your DU-AL, your PASN-AL, or a common area data spaces. In all 
cases, you would not have access to an entry marked "private" unless you have a 
matching EAX.

SNAP(X) provides information only for data accessible from your address space 
(whether because it is part of the address space or is accessible by a suitable 
access list).

Further, if the dataspace is "owned by another address space", it can be risky 
to add it to "your" access list.

Peter Relson
z/OS Core Technology Design


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