Here we would like to draw your attention to GCTA transaction code in SAP. As we know it is being used in the SAP FI-SL (Special Purpose Ledger in FI) component which is coming under FI module (Financial Accounting). GCTA is a transaction code used for Transport Rules in SAP.
It comes under the package for Validation, Substitution and Rules (GVAL). When we execute this transaction code, SAPLGBLT is the normal standard SAP program that is being executed in background. Transaction code GCTA is included in the SAP component for SAP_FIN.
Transaction GCTA technical data table