Freight Condition types FRA1, FRB1, FRC1

Hi All,

when we create PO, we can enter FRA1, FRB1, FRC1 condition types (manually or thro condition records)

for FRA1 and FRC1 -   as we enter a value in Amount field manually - condition value (column in conditions tab of PO) was immediately calculated, and message on effective price was shown

example:     

Effective price is 103,00 EUR, material price is 183,08 EUR    

Message no. 06207

where as for FRB1 (Freight (Value) - when we enter a value in Amount field, condition value is not automatically calculated and no message on effective price is shown. but when i check (ctrl+shift+F3), effective message pop up is shown and condition value is updated.

any idea why FRB1 behaves differently ?

difference in config among these three is only calculation type.

thanks

Mahesh