@property
    def page_height(self):
        pgSz = self.pgSz
        if pgSz is None:
            return None
        return pgSz.h
Make sure that the Line Item for the SMS Rate has the following:
dataset/ETHPy150Open python-openxml/python-docx/docx/oxml/section.py/CT_SectPr.page_height--crossover with--dataset/ETHPy150Open dimagi/commcare-hq/corehq/apps/accounting/tests/test_invoicing.py/TestSmsLineItem.test_under_limit