Receiving message: SHR325I - SEGM SGA151RT. IMODULE DELETE FAILED in a NEON environment. Neon's response is: It looks like IMSHRINK for some reason issued the IMODULE DELETE that failed.
The Neon program was performing parallel processing operations. Placing the *.IMSUT.LOAD library as the first library in the STEPLIB concatenation resolved the problem. This library contains special handling for parallel processing operations. This STEPLIB library sequence should be used for all batch utilities that perform parallel processing.