Here is a resolution for SQL error -206. You will get an error of object is not valid. Here are possible reasons for this error. Also given solution for how to fix it.
In this post, I explained SQL logic to convert SQL error into a text message using DSNTIAR.
Cursor in DB2 and related top errors and resolutions
Resolution for DB2 SQL error -904 and real reason and fix on how to resolve error given in a way easy to understand by beginner to professionals.