Information about implicit enhancement at top include of FUGR

HI Folks,

Implemented several enhancement but never got this type issue.

There is a implicit enhancement present at the top include in a type declaration shown below. If I implement that enhancement, then code below that gets into RED.

I am able to declare additional fields to that TYPES with below syntax :

TYPES : MATNR TYPE MATNR.

If I activate the program,it gets activated,But do not have any idea why it is RED

Is it a problem ? Any Idea on this ? Or is there any other procedure to declare additional fields to the TYPES in a standard program

Thanks in advance

Regards

Ansumesh