When running CA JCLCheck under the CA Endevor processor with altid option and also using the CA JCLCheck SIGNON option, you will need to use ALTID=N. For example,
//JCLC EXEC PGM=JCLCHECK,ALTID=N
The ALTIDD=N will prevent CA Endevor from applying the CA Endevor alternate ID during the processing of JCLCheck. The ID used will be USERID value in the CA JCLCheck runtime option.