Field help (FLG1099) 

The 1099 flag is used to indicate whether a line is submitted to a 1099 declaration. If the supplier must be subjected to a 1099 declaration, the default value of this line will then be positioned to Yes. If a line for this supplier is not subject to 1099, then this flag can be changed to No and the line will not be included in reportable 1099 amount.