Thank you very much for your reply. Explaining that 213 is the subcode was very helpful and pointed to the specified SVC not being an Adabas SVC. However I looked at the SVCTABLE for SVC=225 and it is indeed the Adabas SVC.
I thought maybe it was using the default SVC=249 but that is not even in the SVCTABLE.
Member IEFSSN specifies SVC=225 for SUBSYS=ADAB so it appears to be correctly defined.
Where else is the SVC# specified?
The APA monitor shows DFSPCC20->NII826FR->NIIINTFM->NAT826SH then the NAT3213 message.
I’ve tried running with or without ADANUC running but always NAT3213.
I suspect the problem lies somewhere in the IMS interface as under CICS it all works.
Any further suggestions would be much appreciated,