What is the economic visa for outsourcing projects and how to be responsible for the economic visa for outsourcing projects of construction projects?

That is, the project content not included in the contract scope can be mainly divided into the following situations: 1, the project content entrusted by the owner of Party A; 2, due to design changes or other reasons, the contractor rework again, resulting in repeated secondary construction project content; The visa outside the contract can only be paid after it is confirmed and approved by the owner (i.e. the construction unit) and the supervision unit.