BAPI_PR_CREATE

hi i am using the BAPI BAPI_PR_CREATE and passing the values to differnt parameters, it is accepting, but when i pass the parameter to Commitment item and fund centers, it doesn't take the given parameters but takes some default values, which in then gives an error as that combination does't have any budget, how to solve this i have debug the whole bapi but not able to solve the same,

abhishek suppal