How Restrict the Document overflow button at Va03.

HI,

I have one requirement, I.e I need to Restrict the users , after i click on the Document Over flow button,

Please have a look on below attached image.

here i need to Consider two things or I need to restrict two Important point. User may be Press F5 button , I think this is called Function key.

next After click on the Button Document Over flow button. But i dont know how can i achieve this.

After a lot of search i found that.

MV45AFZZ is the Include it is firing if i open the va03.

But After that i dont know how could i write the logic. Has any body faced this type of problem.

Please Inform me. I need your valuable suggestions.