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In Mexico localization environment, for Sales orders you are able to define value for attribute 'LugarExpedicion' in Site address. However, for Free Text Invoice, you are not able to select a differente 'LugarExpedicion' (which is Zip postal code) other than Legal Entity Zip code.

It would be desirable to choose the value in field 'Address' located in Free Text Invoice header.
STATUS DETAILS
Inactive
Ideas Administrator

Thank you for sharing your idea. 
We haven't heard this from other customers, yet, and this hasn't got enough votes for further consideration. For the foreseeable future, we are not considering the suggestion but if you find more customers that ask for the same scenario, please keep sharing the insights.
We do appreciate your feedback and hope you'll continue to submit ideas for improvement in the future.

Sincerely,
PM, Gilberto Onodera
Microsoft.