Clearing two documents with POSTING_INTERFACE_CLEARING

Hi, all

I'm trying to use POSTING_INTERFACE_CLEARING function module to clearing two documents each other with

additional cost. It's detail is like belows:

1st,

01(D) Customer A/R (100 EUR)

50(C) Sale (100 EUR)

2nd,

40(D) Bank Account (80 EUR)

50(C) Imcoming (80 EUR)

3rd,

40(D) Incoming (80 EUR)

40(D) Cost for sale (20 EUR)

15(C) Customer A/R (100 EUR)

Function Module really works fine.

But the problem is that it displays popup dialog box asking whether to post

the different amount of 1st and 2nd documents.

I have to suppress this dialog box.

But I could not found any way to hide it.

I hope there would be some helpful replies...

Thanks and regards,

Lee