function modules in sales distribution
T Sales and distribution SD function modules
D Sales and distribution SD function modules
& Help Sales and distribution SD function modules
AC_DOCUMENT_GENERATE - Create new SAP document
FI_DOCUMENT_NUMBER_GET - Get SAP document number created
FI_DOCUMENT_CHANGE - Update SAP document
RKE_READ_CUSTOMER_HIERARCHY - Get Customer hierarchy
BAPI_CUSTOMER_GET_CHILDREN - Get customer hierarchy child nodes (also use with table KNVH)