fix: correct taxable amount when group by invoice in GST Purchase Register

[ljain112]

Issue: The taxable value was not getting summed when the group by invoice was selected.

Frappe Support Issue: https://support.frappe.io/desk/hd-ticket/60930

[coderabbitai]

📝 Walkthrough

Walkthrough

A public constant AMOUNT_FIELDS in the GST India GSTR-3B utility module was updated to include "taxable_value" as the first element in its tuple. The constant previously contained six tax-related amount fields and now includes this additional field to expand the set of fields aggregated during per-invoice data computation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fix: absolute item total value for rcm invoice #3755: Modifies how "taxable_value" is handled in RCM e-invoice computations, indicating related changes to taxable value processing in GST workflows.

Suggested labels

backport, version-15-hotfix

Suggested reviewers

• vorasmit
• karm1000

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is directly related to the changeset, explaining the issue being fixed (taxable value not being summed when grouping by invoice) and linking to the support ticket.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title 'fix: correct taxable amount when group by invoice in GST Purchase Register' directly matches the PR's main objective of fixing taxable value summation in the grouped-by-invoice view, and the code change adds 'taxable_value' to AMOUNT_FIELDS to achieve this fix.

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