Diagnosis
You wish to assign an exception to statistic &V3& (country modifer
V1, subtype v2). the statistic has not been defined in table
T543A, which assigns statistics to subtypes.

Procedure
Please define the statistic in table T543A.
Press the F5 key to access the table currently being edited from
table T543A, and F3 to go back to table T543A.