SAP HCM-coverage grouping

Hi,

for my coverage grouping, i have define as married/ single and if an employee died in the course of work, they will be compensate either 15/30 times of their salary and it all depends on their marital status.

For the feature, i have make use of the decision field which is FAMST. For the value of FAMST, what value should I input?

Thanks:)