B1if SQL to SAP doc

Hi!

I create the package in B1if from SQL to SAP Document.

In case SQL call value and put value to SAP, It's ok

In case SQL select with no data, Atom continue to transfer data to SAP and B1i monitoring shows the error :

com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception: com.sap.b1i.bizprocessor.BizProcException: BPE001 Nested exception: com.sap.b1i.utilities.UtilException: UTE001 Nested exception: com.sap.engine.lib.xml.util.NestedException: Variable '$DocDate' has not been bound to a value

How can I set up SQL to document and only catch value in SQL. If SQL can't see any value It will not show the message?

Thanks

Hong Bich