V90 Absolute Encoder + s7-1214 Loses homing after power cycle

Hi I am using v90 + s7-1214 with EPOS. I control the servo on absolute movement mode. So I need it to be referenced. I reference it with SINPOS mode 5 but after turning it off and on it loses the value. AxisRef output becomes FALSE.

My homing steps are like this:

1. write reference value to p2599
2. execute SINA_POS on mode 5
3. write 1 to p0977 / p0971  (I tried both. It didn't work)

I tried using EncoderAdjustment(FB38000) and was not succesful. 
I tried using Homing_V90PN(FB38001). It works for homing but loses the value after power off/on operation.

How do I keep the motor referenced after power cycle. (I've managed to make it with d4x5 technology objects before. But this is the first time I am working with absolute encoder v90 + s7-1200 EPOS)