[18.0][MIG] purchase_substate: Migration to 18.0

[arantxa-s73]

Module migrated to version 18.0

Depends on:

• [ base_substate ] [18.0][MIG] base_substate: Migration to 18.0 server-ux#1018

[Saran440]

@arantxa-s73 Functional Test. I found an error when creating a base substate and adding a target state value. (or when clicking by clicking demo data)

I'm not sure if the error from base_substate or purchase_substate