Autofilling storage location field in ME21N tcode with change in order type field

Hi folks,

I need your help in order to fulfill the above mentioned requirement.

Actually with opening the tcode ME21N and selecting the order type as RETURN PO, I need to make the Storage Location field of the table control in line item to be auto filled as some predefined value like '0001' or like this.

Please suggest your points.

Thanks in advance.

Regards,

Sanjeev