Hi,
you can use the condition exclusion in this case
In SPRO>MM>PUR>CONDITIONS>PRICE DETERMINATION >DEFINE CONDITION EXCLUSION
You can create 2 condition exclusion groups give any name Z1, Z2,
In the next step assuming you maintain price for service, manually it should be PBXX condition, so
assign PBXX to first group, then assign ZBR6 to second group.
Then in the third step select your calculation schema, (check which schema is used) in standard it
should be RM000, select schema hit exclusion, here enter serial number 10, select exclusion
procedure "D" enter group1 (Z1) and group2 (Z2), SAVE
Now when you enter header condition ZBR6, although it will be shown in line item it will not be
added to the pricing, in header you will find one more condition line item for exclusion
There is one more alternative to this, if you don't want to use PBXX , then create one manual item
level condition, and create exclusion for it with ZBR6, at line item maintain this with zero value
system will ignore ZBR6, and take zero value manual condition
Hope this will help
Thanks
DD