ECC 6 - Enhancement Framework

My Requirement is as follows:

I need to add a value on TRNS - MIGO field XBLNR(Reference Number). Which I am getting for the purchase order information.

Enhancement Framework:

I have gone to the PBO so that the field can be added and thus processed with the rest of the information, here I have found a module where my code can be added.

Problem:

Using the new Enhancement Framework on SE37, show all Implicit enhancements, I can see there is an enhancement where I can insert my code, problem is that when I go to change mode those enhancements are no longer visible.

Regards

Yaseen