The agreement was revised as part of the Johnson Department renegotiation in 2019. The amendments fit about 5% of the text.  The House of Commons could accept, refuse or propose alternatives (“changes” or “changes in place”). If Members accept all amendments, the law can be prepared for royal approval and become law. If there are outstanding areas, these issues must be left to the Lords for further consideration. This process (also known as ping-pong) continues until a full agreement is reached or the law is blocked. After the defeat of the five amendments in the House of Commons, the withdrawal agreement was sent back to the House of Lords. 7.According to Section 78 insert – protection arising from the EU withdrawal agreement… The most important elements of the draft agreement are: The DUP, SDLP and Alliance have jointly proposed amendments to ensure that Businesses in Northern Ireland have “unlimited access” to the rest of the UK. On the issue of the Irish border, there is a protocol on Northern Ireland (the “backstop”) which is attached to the agreement and establishes a position of withdrawal which will only come into force in the absence of effective alternative provisions before the expiry of the transition period. In this case, the UK will eclipse the EU`s common external tariff and Northern Ireland will stick to aspects of the internal market until such an event is carried out. Neither party can unilaterally withdraw from this customs union.
The aim of this backstop agreement is to avoid a “hard” border in Ireland, where customs controls are needed.  The British Parliament is bicameral legislation, which means it has two parliamentary chambers. Before a bill can become an act of Parliament, it must be formally approved by both chambers. A bill will first finish its main scenes in one house, then it will complete the same steps in the other house (although both house could arrive first). If the second Assembly amends the bill submitted to it through the first, the first Assembly will be invited to consider these amendments. As part of the English votes for English laws procedure, the spokesperson certifies bills or bills provisions that concern only England and/or England and Wales. With regard to financial accounts, the spokesperson may certify funding applications or clauses or timetables exclusively relating to England, Wales and Northern Ireland. (Similar information about the invoice itself is available in the explanatory notes- see above.).