Hi Eddy,
They're used to specify where the value is get from.
The structure of technical name is: TABLE-FIELD NAME
So, you can go to tcode SE16N to display the table (ei BSEG, KNB1, LFB1), you will know the data will get from which table.
Example: for Payment method,you have
BSEG-ZLSCH: it means, the payment method is choosed from document.
KNB1-ZWELS: payment method is got choosed from Customer master data
LFB1-ZWELS: payment method is choosed from Vendor master data
Like with Term of payment, you have
BSEG-ZTERM: Payment term is choosed from document
KNB1-ZTERM: Payment term is choosed from customer master data
LFB1-ZTERM: Payment term is choosed from vendor master data
As you known, the payment method, or payment term can be different among vendor.customer master data and documents, correct?
That why the system give us some source of data like this case.
If you have more details, please tell me
Julie
