Create Purchase Requisition without supplying the Plant in ME51N

Hello Experts,

I have a strange kind of a requirement where I have to create a purchase requisition in ME51N in which the plant should not be manadatory. I should be allowed to save the PR without giving the plant.

In configuration also I tried keeping the system message as warning and also gave the plant as optional in SPRO in change screen layout but still I'm getting the ERROR message as "Enter Plant".

Please let me know if there is any way possible of doing it.

Thanks,

Naveen