First of all: if the company's sales order needs the signature of the person in charge, it must be signed by the person in charge to take effect. He represents the confirmation of the sales situation, and the signatures of others have no legal effect;

Secondly, if the company signs a contract with the outside world, it is a legal issue between the company and its customers. Generally speaking, it can take effect as long as both parties agree and do not violate the mandatory provisions of the law.

I don't know exactly. What do you mean? Reference can be made to the above explanation.