Can some explain what this means

Kwpn registration papers read;

Excellent E
Ster prok
528003200903124
Wpn
Vb
Tp
Black

Can some explain some of the lingo…ster prok? Wpn, vb, tp?

Also why can’t I find the stallion on the Kwpn site?

TIA

prok - a predicate that means that the x-rays have passed the evaluation criteria of the KWPN
ster - a predicate that means that the horse has met and surpassed the criteria for studbook in regards to conformation and movement/jumping
528003200903124 - Registration Number
Wpn - the KWPN before it received the Royal recognition of the K
Vb - foalbook
Tp - harness horse

Thank you so much!