SAP ABAP Message Number RL - 304 (RL) is used by

• Function Module (3)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Function Module	RELMOD_CHECK_BINRELATION	Check if type of link allowed with object types	SREL	BASIS	SAP_BASIS
2	Function Module	RELMOD_OBJTYPES_OF_ROLETYP_GET	Determine allowed object types for the role type	SREL	BASIS	SAP_BASIS
3	Function Module	RELMOD_READ_ROLETYPE	RELMOD_READ_ROLETYPE	SREL	BASIS	SAP_BASIS