From where Exchange rate Variance defaults the account during invoice validation for PO matched

Summary: For inventory-based PO which is matched to invoice, "exchange rate variance" defaults an account value which business wants to change

Content (required): Account rule for Exchange rate variance is "Exchange Rate Variance Gain/Loss Natural Account Segment" which has source "Purchase Order Rate Variance Gain Account". Wanted to understand where "Purchase Order Rate Variance Gain Account" gets the value from.

Version (include the version you are using, if applicable): 23B

Code Snippet (add any code snippets that support your topic, if applicable):