[Master]- Create Documents on Recurring Billing ignores the Partner filter and fails when a vendor billing proposal exists

[Fixes4BC (neeleshsinghal)]

What & why

Linked work

Fixes #

How I validated this

• I read the full diff and it contains only changes I intended.
• I built the affected app(s) locally with no new analyzer warnings.
• I ran the change in Business Central and confirmed it behaves as expected.
• I added or updated tests for the new behavior, or explained below why none are needed.

What I tested and the outcome (required — be specific: scenarios, commands, screenshots for UI changes)

Risk & compatibility

[github-actions]

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