Table Maintainence Problem

Dear all,

I am facing a problem in table maintainence generation.

I have a table with 50 fields and the maintainence is getting generated.

However, in SM30/31, I cannot see the name of the fields.

Just getting the sign + instead of the field name.

Eg: + is diaplayed instead of PO Number.

If anyone can help me out, it wud be great and be rewarded.

reagrds,