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Validation ErrorThe operation cannot be completed: - Create/update: a mandatory field is not set. - Delete: another model requires the record being deleted. If possible, archive it instead. Model: Sales Order (sale.order) Field: Branch (branch_id)

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This is definitely come from your customer module that contain field banch_id, in order to fix this, try to fill the value for branch_id either by python code or edit on view which will depend on your custom addons

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