[FIX] hr_expense: unbreak consistency check
[FIX] hr_expense: unbreak consistency check

Purpose
=======

Unbreak consistency check:

- on creation (check not done)
- when applied to a record set of several sheets belonging to different employees (reporting spurious errors)

Specification
=============

- self.something() in a api.model method does not make sense, so I replaced it with a call on the newly created sheet.
- Iterate on sheets instead of mapping all the lines

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