Find out if the Sale is invoiced or not

Hi Gurus,

I have been working on a Sales Reporting project where I am using 2_LIS11, 2LIS_12 and 2_LIS13 datasources to extract data from SD to BW.

I need to find a way to distinguish sales if it is an invoiced sales or not.

Do you now if there is an indication field that can help me to clarify if the sale is invoiced or not?

What could be another way to clarify this point?

Thanks.