'BAPI_ISUCONTRCT_CHANGEFROMDATA' what all paremetes i need to pass

Hi Experts,

In

'BAPI_ISUCONTRCT_CHANGEFROMDATA' what all paremetes i need to pass in import structure

contractdata =

contractdatax =

in contractdata i am passing vertrag what else i need to pass in this structure

, in contractdatax all parameters are size of characters 1

Thanks