DTP selection not working

Hi experts,

I have a an issue with a DTP. When, the request is loaded to the DSO, i can see the following:

So i understand, that there is a filter on this DTP (selection conditions) : all the records that have a ZZGEST initial have to be excluded.

The problem is that i found in DSO some records with an empty ZZGEST, i checked the transformation, there is no treatment on that fields, only direct assignmet.

Can someone confirm that what i see in selection condition is what i understood?

If so, i am going to delete those records in end routine to be sure to not corrupt data.

Thanks.

Amine