This question is not clear to me. or
Between us speaking, I would try to solve this problem itself. or
You commit an error. Write to me in PM, we will discuss. or
Good business! or
It has no analogues? or
In it something is and it is excellent idea. It is ready to support you. or
Excuse, that I interfere, there is an offer to go on other way. or
Very similar. or
I am sorry, that has interfered... At me a similar situation. Let's discuss. Write here or in PM. or
I think, that you are not right. I suggest it to discuss. Write to me in PM, we will talk. or