While trying to create the child case when parent case has been opened in perform mode, Child case details (Covered releated details) not updated to parent case. Thats why "we are getting Work Object not found in current Application. Please check ID and try again." error harness when trying to access the child case after child case creation.

As per my understanding this issue is related to lock of parent case. We are using OOTB activity (pxAddChildWork) for adding child case to parent case. Could you please help me where we are handling (In which activity)  locking and unlocking things of  the parent case.