Account determinations in SAP, also referred to as automatic account assignments, are pre-assigned G/L accounts used in specific business transactions. For practical purposes, account determinations automatically generate FI line items (for transactions originating in FI) or entire FI documents (for transactions originating outside FI). In posting FI documents, account determinations provide consistency, ease of entry, and accuracy.
In this document author covers configuration of account determinations in SAP using transaction codes in detail.