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This article explains that unresolved references in the call subroutine may result in this error.

Problem:

Our application uses subroutines located in callable shared objects (.so) extension. An RTS 198 abend occurs when calling the subroutine. Why is this?

Resolution:

The most comon cause of this error is that there are unresolved references in the call subroutine. Compile the callable shared object using the -U option. Calls to genuine unresolved symbols will cause RTS 173 errors to be reported.

Old KB# 14052
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