SerialAndBatch sample. Error message: You should use existing serial/batch numbers for this document type

Hi all.

I have a problem creating serial number. this is SerialandBatch sample from SDK.

But it does not create Serial number for item. It always shows You should use existing serial/batch numbers for this document type.

The error appears here:

globalD.RetVal = globalD.oInvGenEntry.Add();

I can do it in client. When I create Goods Issue, after clicking Add button, I write serial numbers.

But in sample it does not work for me. what is wrong ? Help to solve please.

Thanks in advance.