How to change "Customer Data" tab name to some other text in PR(ME52N)

Hi Experts!,

I have used Enhancement MEREQ001 for adding a field in Customer data TAB at item level in Purchase Requisition(ME51N/ ME52N/ ME53N). Every Thing is working Fine.

Now my requirement is to change the name of the TAB i.e from CUSTOMER DATA to some text say...."SUBCON DATA". Through USER EXIT we can't as I did lots of R&D. Please let me know how we can change the name?.

If we are to modify in standard program , then please suggest the program name where by implicit enhancement we can change.