ContextID callSBF has an invalid signature

Hi everyone

I'am trying to call web service from BSFN and I see this error on BSSV serwer.

[SEVERE][BSSVFRAMEWORK][Context ID: callSBF] Requested BSSV Methodoracle.e1.bssv.JP5A0105.LotosCallExternalWSManager.LotosCallExternalWS has an invalid signature.

this is my code in C

     FormatMathNumeric(szInternalID, &lpDS->mnInternalID);

   //<lotos - call - external - wS_vo - input><document - type>< / document - type><internal - iD>0< / internal - iD>< / lotos - call - external - wS_vo - input>

   jdeStrcpy(xmlIn, _J("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"));

   jdeStrcat(xmlIn, _J("<lotos-call-external-wS_vo-input><document-type>"));

   jdeStrcat(xmlIn, lpDS->szDocumentType);

   jdeStrcat(xmlIn, _J("</document-type><internal-iD>"));