Hello, everyone!
I have built simple composite data entity:

consisting of 2 data entities.
I'm having dificulties with exported file, when I export using this composite entity tag names are different than column name in table(added underscore).
Mapping visualization:

Exported file using composite data entity:

Exported file using simple data entity:

Can't figure out why it's happening.
Because of this, when i want to import this file back, automatic mapping doesn't work, have to do it manually.
Any help appreciated!
Kind regards,
Maris