DSXchange

Here is the derivation(routine call) in Transformer stage of Job TESTAA0007 :-

MyGetLinkCount("TESTAA0006","Transformer_1","DSLink4")

After including those comments here is the log :

Transformer_2(): Routine input variableJobName is "TESTAA0006"
Transformer_2(): Routine input variableStageName is "Trasnformer_1"
Transformer_2(): Routine input variableLinkName is "DSLink4"
Transformer_2()(fatal error from DSAttachJob): Job control fatal error (-12)(...)

So within the routine MyGetLinkCount it is unable to attach job TESTAA0006. I checked it is not running.

Error -12 is DSJE_BADNAME /* Job name badly formed */ - check to make sure it exists as you've specified it, down to the casing of the letters.

If you find that the job name checks out OK, check the stage name. "Trasnformer_1" seems to me to be misspelled.