We are upgrading our SAP System from 4.0B to Enterprise Edition applying hot packages. But another Java and XML...
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based application failed probably because of this. The Java and XML based application is using jco-ntintel-1.1.
Do we need to upgrade the JCO server also? Or is the problem somewhere else?
Details of the error message:
SAP Connection Error Try After Some Time
Detailed Description Of Problem
com.sap.mw.jco.JCO$AbapException: (126) NOT_FOUND: Control area data not found.
I do not know any specific reason why a JCo application should fail when you upgrade to 4.7 other than if you enable Unicode in R/3, in which case you need to change your JCo release to 2.1.1 and read SAP's documentation about using Unicode with JCo.
If Unicode is not the culprit, I would need more detailed information about the specific error you encounter. Upgrading to JCo 2.1.1 would be a good idea in any case.
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