Cost method of product should be limited to fixed for service

I think other cost method for service has no meaning.

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added easy label

I add review34701002 for product and review29241002 for product_cost_fifo as the selection behavior is changed.

assigned to @xcodinas

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New review34701002 at https://codereview.tryton.org/34701002/#ps1

New review29241002 at https://codereview.tryton.org/29241002/#ps1

review29241002 updated at https://codereview.tryton.org/29241002/#ps20001

review34701002 updated at https://codereview.tryton.org/34701002/#ps20001

review34701002 updated at https://codereview.tryton.org/34701002/#ps40001

review34701002 updated at https://codereview.tryton.org/34701002/#ps60001

review34701002 updated at https://codereview.tryton.org/34701002/#ps80001

review34701002 updated at https://codereview.tryton.org/34701002/#ps100001

review34701002 updated at https://codereview.tryton.org/34701002/#ps120001

review34701002 updated at https://codereview.tryton.org/34701002/#ps140001

New changeset 2f79f3444da6 by Xavier Codinas in branch 'default':
Limit cost method to fixed for service
http://hg.tryton.org/modules/product/rev/2f79f3444da6

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closed

Re-open it because it breaks scenario of other modules: https://drone.tryton.org/tryton/modules.account_invoice/8

reopened

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I think we can not put a domain (or any restriction) on a Function field.
So with review36641002, I replace the domain with an on_change.

assigned to @ced and unassigned @xcodinas

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New review36641002 at https://codereview.tryton.org/36641002/#ps1

New changeset 300b8548e9d2 by Cédric Krier in branch 'default':
Replace domain on cost_price_method by an on_change_type
http://hg.tryton.org/modules/product/rev/300b8548e9d2

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closed

mentioned in issue #6277 (closed)