[FIX] Use the new API in stock.picking._check_simi_number() method

Merged Gabriel Davini requested to merge 8.0_simi-fix_simi_constrain into 8.0_simi

_check_simi_number() method is raising the following exception:

ValidationError: ('ValidateError', u'Error while validating constraint\n\n_check_simi_number() takes at least 4 arguments (1 given)')

This commit fixes it.

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