Storage process step is not assigned to storage process

Dear Experts,

During selecting "Close" button in HU in Packing workstation, I am getting the error message

Storage process step OB02 is not assigned to storage process

Message no. /SCWM/WM_SEL041

Have you ever come across this message? What could be the reason? please help solving the above isue.

Regards,

Shetty