What is PICK REC in this context?

The PICK is used to differentiate between the types of PICK and PHYSICAL. In general PICK type locks are going to be created via a READL or READU statement and often called soft locks. Other than that the use of the word PICK in this regard are historical.

The types of lock that could be seen are :-

PICK FILE

PICK REC

PHYSICAL FILE

PHYSICAL RECORD