Query
I am uploading Sales Invoices using the Standard template provided with udi-Magic. Though I have specified the Party GSTIN and State-Name, it is NOT updated in the LEDGER Master for existing Customers.
Answer
You must use the Master-LedgerMaster.xls to update / set the GSTIN; State-Name for any existing Customers in Tally.
PS:
The Sales Invoices template creates new Party ledgers (if not found in Tally), but it does NOT update LEDGERs that already exist in Tally.