open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello dear ones.
I'm trying to do interpolation and put the velocity current data into the structure
UBORL%R(IBORD)=UUSER
VBORL%R(IBORD)=VUSER
but in structure:
IBORDUSER = ((NP-1)*NUV + (K+1)) which I am using to capture the current value of the file, the lop always repeats the same point. K does not vary within the loop. Is there any limitation in the structure that uses the NP variable?
Thank you for your attention.