Hi - with the current reporting tool (which is getting an update in the future), the document object type is too far away from a Proof Approval Object to do filtering on that.
By any chance, can you get what you need from a Document Version report? Like, is seeing "Proofs on DestA, DestB, or DestC projects" okay? Or do you need a line item for each approver?
If you don't need a line item for each approver and just want which proofs, try this code in a Document Version report...
EXISTS:1:$$OBJCODE=DOCU
EXISTS:1:ID=FIELD:documentID
EXISTS:1:DE:project:Destination=DestA
EXISTS:1:DE:project:Destination_Mod=in
EXISTS:2:$$OBJCODE=DOCU
EXISTS:2:ID=FIELD:documentID
EXISTS:2:DE:project:Destination=DestA
EXISTS:2:DE:project:Destination_Mod=in
EXISTS:3:$$OBJCODE=DOCU
EXISTS:3:ID=FIELD:documentID
EXISTS:3:DE:project:Destination=DestA
EXISTS:3:DE:project:Destination_Mod=in
isCurrentVersion=true
isCurrentVersion_Mod=eq
proofDecision=pending
proofDecision_Mod=cieq
proofID_Mod=notblank
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