Relax requirement that source GLN must have GLN extension

Dear @Aravinda93 , 

I just noticed that if I want to indicate a GLN as a source location, the test data generator requires a GLN extension: 

<img width="1163" height="317" alt="Image" src="https://github.com/user-attachments/assets/85d28f59-2957-49d0-b1ff-3e35e4be909b" />

Would you mind to relax this so that a GLN only is sufficient? 
Many thanks in advance. 
  
Kind regards,
Ralph 