I found a couple references to this error, but nothing has worked so far.  The error I get is....

Account: bad field names on insert/update call: QTT_RID__c

INVALID_FIELD_FOR_INSERT_UPDATE

I am using IBM's WebSphere Integration Developer.  I login and save the SessionID and ServerURL.  I then call the create function and get the error.  I have updated the WSDL.  I checked the field in SalesForce and it doesn't look like it is read only, but when I take the field out the create goes through correctly.  Any ideas?

Thanks,

Dan