Unable to create plug-in

Hi there,
I’m unable to create a Natural plug-in.
The GENERATE text file:

 
 Starting generation of plug-in BECKER0805PLUGIN in library KBPLUGIN.

 COPY ALL NSTTMP-O FROM SYSEXPLG TO KBPLUGIN REPLACE
 4868 Function completed successfully.

 COPY ALL ON* FROM SYSEXPLG TO KBPLUGIN REPLACE
 4868 Function completed successfully.

 DELETE ALL NSTPLG-K IN KBPLUGIN
 4867 Nothing found for this request.

 COPY ALL NSTTMP-K FROM SYSEXPLG TO KBPLUGIN REPLACE
 4868 Function completed successfully.

 RENAME ALL NSTTMP-K AS NSTPLG-K FROM KBPLUGIN TO KBPLUGIN REPLACE
 4868 Function completed successfully.

 COPY ALL INSTALL FROM SYSEXPLG TO KBPLUGIN REPLACE
 4868 Function completed successfully.

 COPY CAT INSTAL-N FROM SYSEXPLG TO KBPLUGIN REPLACE
 4868 Function completed successfully.

 Opening constant definitions template NSTTMP-T in library SYSEXPLG.
 Done.

 Applying replacements to template.
 Done.

 Applying replacements to class NSTPLG-K.
 Error 726 occurred. Generation terminated.

It worked in a lower version. Currently using 6.3.3.

Steplibs SYSEXPLG and SYSEXT are okay. System files also.
Any ideas?

Regards
Karsten

I moved this item to Natural Basics on Open Systems. This Forum applies more to the subject than SPoD.