I Need To Initialize The Vendor Bill, And An Erroe Keeps Appearig Please Help.

There is a bug which is unresolved in Boomi, i.e., BOOMI-30118. It is a code error where VENDOR_BILL is named as VENDPR_RETURN_AUTHORIZATION. There are two alternatives for this issue which goes as follows 

Until the Built-in Netsuite bug is resolved, use SOAP connector to initialize the request. A temporary licence can be acquired from your account manager to use the SOAP Connector. 

It is not an easy process, but we can acquire all the required Fields through queries, then directly map the create req. Here an initialize is not required.