SAP DIAPI & B1if Errors : XCE208 resource is busy & Entry already exists -2035

Hi Experts,

     We recently upgraded from SAP 8.82 PL07 to 9.1 PL05.

     We use two kind of  own addons ,

          1. Windows application which posts to SAP B1 using DI API

          2. Posts using B1if (HTTP Rest protocol) with b1if version 1.20.9 and its SLD Type is SAP B1 9.0.  

             But, its posting without above error using B1if version 1.18.9 with SLD Type SAP B1 9.0  for SAP 9.1 DB.

         Solution Required : What i have to do for in b1if 1.20.9 with out above error?.

        2.  We getting below error in  above two applications

             "This Entry already exists in following tables (ODBC -2035)"

         Solution Required : What is the issue and how to resolve?.

Thanks & Regards,

Venki .A

+91 9585505514