Hi, the field in Detailed GST Ledger Entry should be Buyer/Seller Reg. No., and it's not copied from the customer or vendor ledger entry. The GST posting code fills it during posting, from the vendor or customer, or from the Order Address or Ship-to when a code is on the document. That's why everything else looks fine and only this table is wrong.
The same number on unrelated vendors and even customers doesn't look like setup. More like a value staying in memory between postings, or a filter that finds that one Order Address when the code is blank. Worth checking if the wrong entries come in blocks, same user, same day, right after an invoice of that vendor. And if any extension touches the GST posting.
The India GST apps are open source in Microsoft's ALAppExtensions repo on GitHub, a search for Buyer/Seller Reg. No. shows where it's assigned. If it's standard code, open a support ticket.
Glad to help - follow up if anything is unclear.
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Regards,
Grigorios Mavrogeorgis
Business Central Consultant & AL Developer
Work: Gmsoft Limited
Blog: insidebusinesscentral
LinkedIn: linkedin.com/in/gregorymavrogeorgis