Fix Service Mgt. Setup template configuration in PEPPOL service tests

[Copilot]

Service invoice and credit memo tests were failing because Service Management Setup lacked required template names when creating Service Headers.

Changes

• Added SetupServiceMgtSetupTemplates() helper: Configures Service Mgt. Setup with Gen. Journal Template names for both invoice and credit memo templates before creating service documents

• Applied in two locations:

  • CreatePostServiceDoc() - affects multiple service invoice/credit memo tests
  • ExportXml_ServiceInvoiceLCY_InvRounding_Positive() - direct service header creation

Pattern follows existing implementation in PEPPOL30ManagementTests.Codeunit.al.

local procedure SetupServiceMgtSetupTemplates()
begin
    LibraryERM.FindGenJournalTemplate(GenJournalTemplate);
    GenJournalTemplate."Posting No. Series" := LibraryERM.CreateNoSeriesCode();
    GenJournalTemplate.Modify(false);
    ServMgtSetup.GetRecordOnce();
    ServMgtSetup."Serv. Inv. Template Name" := GenJournalTemplate.Name;
    ServMgtSetup."Serv. Cr. Memo Templ. Name" := GenJournalTemplate.Name;
    ServMgtSetup.Modify(false);
end;

Fixes 5 failing tests: ExportXml_PEPPOL_BIS3_ServiceInvoice, ExportXml_PEPPOL_BIS3_ServiceCrMemo, ExportXml_PEPPOL_BIS3_ServiceInvoiceFCY, ExportXml_PEPPOL_BIS3_ServiceCrMemoFCY, ExportXml_ServiceInvoiceLCY_InvRounding_Positive.

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