Diagnosis
The period modifier defines how often contributions are made to a plan.The system calculates plan costs taking this into account.
During this calculation of cost, the system reads table T549Q toestablish how many periods there are of a particular sort (e.g.bi-weekly) in a year.
The number of periods could not be found because there is an error inthis table.

Procedure
Check that the entries in table T549Q are correct and complete.