P equipement on the flight plan

[crjlover]

Yesterday I was looking at some BA flight plans and in the equipment field I saw for the first time the letter P.
I never saw that before and also in all my books there are no sign of P as an equipment.

[Celestar]

/P = Xpdr. S P.A.

[crjlover]

The strange thing is that is not in the Xpdr of the equipment, I Give you an example:

SPRWY/CD

any idea??