Hi Garbhan,
What you’re seeing in 2025 R2 is actually the new standard behavior.
In 2024 R1, the Add PO / Add PO Line / Add Subcontract / Add Subcontract Line buttons on Bills & Adjustments filtered by both Vendor and Project (when a project was selected on the bill).
In 2025 R2, the lookup now filters by Vendor only. The Project is no longer part of the default filter logic.
There is currently no configuration setting or preference to control this behavior — it is handled by the underlying system query.
Option:1
Practical (No Customization Required)
Users can apply a filter on the popup grid:
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Click Add PO Line (or related button).
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Use the Project column filter.
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Save a Personalized View with that filter applied.
This keeps the system standard and avoids customization, but requires user discipline.