It is only urgent for you - maybe next time you should post the question earlier then it will not become an urgent case

Anyhow, it is yourself who is mainly responsible to speed up or slow down the process, with a well prepared question and sufficient in detail people might be able to answer right away.

Without enough details, some people will just close your question after reading and move on, others like me will ask questions to you like these:

What exactly do you mean by Inventory transfer?

Which transaction did you use, between whom is this transfer?

Between 2 companies, between 2 plants or between 2 storage locations?

What transaction did you use for this process and what movement type was used?

In which transaction are you right now where "Copy to option is disable" ?

And why is an invoice question posted with the MM Inventory Management tag? I have never seen a invoice transaction in the MM Inventory Management menu in SAP.