The Purpose of Agreement Quantity Field

Summary:

Hello, 

There is a field called "Agreement Quantity" on line level. What is the purpose of this field ? 

Is there a documentation where I can find list of the fields, corresponding description and usage of the each field ?

If not, could you please help us with elaborating the documentation by adding the field descriptions so that we can understand the usage of each field ? 

Thanks. 

Regards, 

Sinem