SAP ABAP Message Number 1S - 537 (1S) is used by

• Function Module (2)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Function Module	SSFS_CALL_CONTROL	SSFS_CALL_CONTROL	SECF	BASIS	SAP_BASIS
2	Function Module	SSFS_GET_SIGNATURE	SSFS_GET_SIGNATURE	SECF	BASIS	SAP_BASIS