[MIG][9.0] account_invoice_merge_purchase module

[cubells]

• Updated README
• Updated tests

cc @Tecnativa

[rafaelbn]

Hi, I don't see this option:

[pedrobaeza]

Current runbot contains this.

[chienandalu]

Functionality is ok. However I'd suggest to pop a warning whenever the responsible differ across invoices in the same way it does with other not compatible merging parameters (different partner, paid o open bill...).

[pedrobaeza]

@chienandalu That's out of the scope of this module

[chienandalu]

@pedrobaeza The problem is that when the bill responsible differs, those bills are not going to merge but the user has no clue about the reason why the merging didn't success. So the user is going to have to review manually every not merged bill and find out.

[pedrobaeza]

This module is only a glue module that adds purchase fields to the merge process. What you are mentioning is something for the main module, account_invoice_merge. That's why I say this is out of scope of this PR. Anyway, previous screen before merging informs about the criteria to merge invoices. You should fill an issue with the improvement you are mentioning (which is good, that's out of question), but for being done in the module account_invoice_merge.

[chienandalu]

Absolutely right, @pedrobaeza 😄 I missed the point

[chienandalu]

functionality 👍