Hi jon ,
Thank you very much for your email.
Yes, you are right, features like this are part of a premium service elsewhere. ATUM is at the beginning of its road and has tons of things still to come. We have not yet decided what will hit the free version, but auto POs will be part of the premium Purchasing add-on we would like to release at the end of 2019.
Please, accept our apology for any inconvenience caused.