One way to ensure a correct double dipping is to tell the agent about these fields:
AP FAX-1 SSRFQTSSQHK/ SQ K xxxxxxxxxx
2.1 SSRFQTVSQHK/ SKEBxxxxxxxxxx.G
First line shows the sectors (FQTS)will go towards PPS qualification.
K shows just a regular member or not enough yet to qualify for PPS.
Q will show the pax is a Qualified PPS.
T is for Solitaire
Second line (FQTV) shows the FFP where the miles will be credited.
In my example, the pax is a member of SK Euro Bonus and is a *G.
Another way to check is by looking at the BP.
Name of Passenger
SQxxxxxxxxxx QPP 8
UA*G ETKT
Below the name of pax, you will find the SQ KF number. Right hand side, you will see the status on SQ, which in this case a QPP 8.
The next line will show where the miles will be credited, which is in UA MP, and the pax is *G.
To the right will show ETKT if the pax has a E-tix.
Happy travelling.
