Hi Mario,
The root cause of not been able to generate an xml stack file was of other unsupported components.
In our case: outdated Fiori Wave 1 applications. After deinstalling those applications according to note 2015855, updated SLD and sync LMDB from SLD, we where able to generate a correct XML stack file.
This weekend busy to install PLMWUI 747 and SP via SUM.
I will let you know the result.
Many thanks for your input!
Kind regards,
Jacco Raymakers.