Assertion when assiging shipment_party in sale.amendment.line
https://hg.tryton.org/modules/sale_amendment/file/tip/sale.py#l232
shipment_party in sale.amendment.line should be Many2One to party.party instead of party.address.
https://hg.tryton.org/modules/sale_amendment/file/tip/sale.py#l232
shipment_party in sale.amendment.line should be Many2One to party.party instead of party.address.