Hi Jurgen,
Correct, for MD14 and MD15 it is working properly and the result was okay. System will pick the correct number ranges:
* PR Document Type : ZZZZ --> Internal number range : 1111111111
* PR Document Type : XXXX--> Internal number range : 2222222222
Do you have any idea why it can't work if i run with Tcode MD03? Thank you.