How to show field at item detail level (purchase requisition layout)?

Hi, gurus!

We're trying to get field "processor" shown at item detail level (release strategy tab) when we create, modify or display

a purchase requisition.

We click on right button, select "Show" and get column name "Processor" in displayed columns and save layout as default,

but that field is not visible when entering again transactions ME51N, ME52N or ME53N.

Could anyone help us?

Thanks in advance

Regards,

J Madariaga