Enhancement Z_ENH_IMPLEMENTATION must still be adjusted

Hi Experts,

We were on ECC6.0 and on Release 7.0.

I implemented a Explicit enhancement in sales order, well.

Immediately next day (meaning my enhancement implementation is not even moved to TEST/QA system!) system upgraded/service packs applied and made into Release 7.1(current).

Now, I want to do some changes to this enhancement implementation, so, I did right click and choosen the 'Change implementation', but the system is not letting me to do so! am getting a message saying that "Enhancement Z_ENH_IMPLEMENTATION must still be adjusted"

1) Pls. let me know is this is because of service packs to 7.1?

2) If so, How shuld I re-adjust it?

3) or do u want to suggest to remove this entire implemetation and to create a new implemetation with my changes?

Thank you