Message SAP XS031 - No conversion known for & to &

Diagnosis
An object in a document to be sent is in "&V1&" format. It is to beconverted to "&V2&" format for sending. No conversion function isknown.

System Response
Action was terminated.

Procedure
Make a function module available that performs the required conversionfrom "&V1&" to "&V2&". Declare it in the configuration of SAPconnect(table SXCONVERT2, possibly table SXDEVTYPE).