[Extensibility Request] issue 30362: add OnPostDocumentLinesOnBeforeInsertPostedHeaders event to Service-Post

[AleksandricMarko]

Summary

The reporter builds solutions with custom Service document types and needs to control which posted document is created during Service posting. Codeunit 5980 Service-Post currently hardcodes the decision of whether a posted service invoice or credit memo header is created, so extensions cannot alter this flow the way they can in Sales-Post. This PR adds an IsHandled integration event immediately before that logic, bringing Service-Post extensibility in line with Sales-Post.

Source issue repository: microsoft/AlAppExtensions; issue number: 30362

Changes Made

• OnPostDocumentLinesOnBeforeInsertPostedHeaders - new IsHandled integration event raised in PostDocumentLines right before the posted service invoice/credit memo header creation, letting subscribers replace the standard decision; the same change is propagated to the NA and IT layer counterparts.

Fixes AB#643301

[qasimikram]

S1 - The new IsHandled path is unsafe because it skips Serv-Documents Mgt. preparation, which initializes temporary posted headers, journal document parameters, logs, comments, and incoming-document state. The subscriber only receives ServiceHeader and document-number variables, so it cannot initialize the same codeunit instance before PostDocumentLines and finalization consume that state. Please narrow the extension point or expose a safe replacement contract, and add a subscriber-path test covering posted headers, lines, and journal document numbers.

S2 - Pass ServiceHeader by value unless a specific late-mutation contract is required and tested. The equivalent Sales-Post event uses a value parameter, and var permits mutation after posting checks and initialization.