[main] Bug 649189: Update E-Document vendor invoice caption

[Milica Đukić (djukicmilica)]

What & why

The E-Document purchase header field used to resolve the invoice referenced by an imported purchase credit memo was labeled as a vendor invoice number. This was misleading because the value is the external invoice number that the document applies to.

Update the table field caption and the readable purchase document page caption and tooltip to use the applies-to terminology.

Linked work

Fixes
AB#649189

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

• Ran git diff --check; it completed successfully.
• Verified the table field and page control use the exact caption Applies-to Ext. Invoice No. and that the tooltip describes the applies-to behavior.
• No automated tests were added because this change only updates display metadata and does not alter application behavior.
• The local container build and UI validation were not run because Docker is unavailable in this environment.

Risk & compatibility

None. The field ID, name, type, and behavior are unchanged; only the displayed caption and tooltip are updated.

[github-actions]

Issue #11168 is not valid. Please make sure you link an issue that exists, is open and is approved.