BAPI Error...

Hello All,

I'm facing an error when I try to run the RFC from an external application. The scenario is like this:

When I try to run the BAPI (BAPI_SALESORDER_CREATEDAT2) through transaction SE37, there is no problem, the Sales Order gets created. But when I try to run the same BAPI as an RFC through an external application like Sybase Unwired Platform (SUP), it throws an error saying,

"Execution Failed: [0]TYPE:<<A>>, MESSAGE:<<Date 01.01.1900 is before the beginning the factory calendar 01>>[1]TYPE:<<E>>,MESSAGE:<<Sales Document was not changed>>"

I'm passing the same input fields as in the case of SE37. Kindly help me solve this issue...