SAP ABAP Message Number 5A - 018 (5A) is used by

• Function Module (4)
• Program (18)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Function Module	HRHAP_DEQUEUE_OBJECT	Lock HR Objects	PAOC_HAP_TEMPLATE	ABA	SAP_ABA
2	Function Module	HRHAP_ENQUEUE_OBJECT	Lock HR Objects	PAOC_HAP_TEMPLATE	ABA	SAP_ABA
3	Function Module	HR_DEQUEUE_OBJECT	Unlock HR Objects	SP00	BASIS	SAP_BASIS
4	Function Module	HR_ENQUEUE_OBJECT	Lock HR Objects	SP00	BASIS	SAP_BASIS