When we try to post a payment of a invoice through the Payment Diary of a vendor with different Posting groups the system don't pick the correct posting group from the Invoice.
If you manually populate the journal then you will need to manually change the posting group as well. Reason being that when you add a vendor to the journal, the system simply takes the default posting group from the vendor card.
If you populate the journal by using the 'Suggest Vendor Payments' function, then the system will automatically change the posting group to what you had on the invoice.
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