Hi,
please check the following SAPNotes:
- http://service.sap.com/sap/support/notes/2173318
- http://service.sap.com/sap/support/notes/1993784
- http://service.sap.com/sap/support/notes/2066205
The "XCE208 resource is busy" error will be automatically handled by B1i error handling, the default is a message retry after ten seconds.
Please check the SAPNotes above to generally optimize the DI Proxy handling of the integration framework. Especially the attached documentation "HowToUseEnhancedDIAdapter.pdf" from SAPNote 1993784 about using the enhanced DI Adapter functionality.
Best regards
Bastian
P.S.: Please try to use the actual version of the integration framework (part of SAP B1 9.1 pl07).