SAP ABAP Message Number CP - 423 (CP) is used by

• Function Module (2)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Function Module	CO_DT_OPR_VORNR_CHK	CIM order: check if doc. no. of an operation already exists in sequence	CO	APPL	SAP_APPL
2	Function Module	CP_DT_OPR_VORNR_CHK	Check whether operation/activity no. was already assigned in sequence	CP	APPL	SAP_APPL