PER_EXT_CONT_CONTACT_TYPE DBI is not working

we hae Rate calculation FF to calculate the rate for Voluntary Life Spouse plan based on Age and Tobacco Use. I have attached the fast formula. I have also attached the image of the error. Based on my analysis

Spouse date of birth is not getting fetched correctly as it is not even entering the while loop

WHILE PER_EXT_CONT_CONTACT_TYPE.exists(i) Loop

That would be really great if you can help on this.

Thanks,

Minati