Backport #10990: [29.0] Add Expense VAT settings to Contoso demo tool

[Alexander Yakunin (Alexander-Ya)]

Backport of #10990 to releases/29.0.

Original change: Add Expense VAT settings to the Contoso demo tool.

Bug AB#648895

[alexei-dobriansky]

Good Sense Reviewer - Round 1

Recommendation: Request Changes

What this PR does

The change wires Expense VAT rate creation into the Contoso demo module for the 29.0 branch. This should let demo data create VAT product posting groups, VAT posting setup, and default VAT settings for Expense Agent categories.

The new call is not enough to create a complete setup. The VAT rate code depends on the Expense Agent setup already having a default VAT business posting group. In this branch, the setup data does not set that field before the new direct call creates VAT posting setup.

Problem-solution fit

Fit: Partial

The change adds VAT rates to demo master data, but it does not apply the full setup state that the VAT flow needs. A demo company can still be left without the default VAT business posting group used by agent-created VAT specifications.

Suggestions

S1 (🔴 High): Set the VAT business default before rates
The new Codeunit.Run(Codeunit::"Create Expense VAT Rates") call can run while Default VAT Bus. Posting Group is still blank. Then the rates are created for the wrong VAT business group, and later agent VAT specifications can fail because the setup default is missing. Please set the default VAT business posting group before creating the rates, and keep the applied flag in sync with that setup step.

Risk assessment and necessity

Risk: This affects Contoso Expense Agent demo setup and VAT posting setup. If the default VAT business group is missing or the rates are created against a blank group, demo expenses can fail VAT specification insertion or use incomplete VAT setup.

Necessity: The change is needed so demo data includes the VAT settings used by Expense Agent. The scope is right, but it needs to create a complete VAT configuration, not only the rate rows.

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