pybill #4362 User customized metadata for bills [resolved]

In the bills heads, there are various metadata informations (reference, pruchase reference, etc.). Today, we have only a few informations that are defined in the xml bill file.

We would like to add customized metadata (name and value) that could be different in each bill. Of course, there are still standard metadata (reference, purchase reference, etc.)

appeared in<not specified>
done in1.0.0
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