Expense PO charge account is not derived on basis of PPM Account rules

We have account rules in PPM, that Expense PO charge account is derived on basis of Work type to CIP Account Mapping set.

In the rule we have use Input source as Work type ID and value set as ORA_PJC_WORK_TYPES_VS and output as Natural account.

But when we are deriving account in PO its giving the error that charge account cannot be derived.

Thanks