Sum of (first period only)

Aggregation Sum of (first period only) ([Measure])

Returns the sum of all values in the expression only for the first known date.
For instance the value for Q1, will be the first know value in Q1, a sum will be applied on all other dimensions.
This aggregation rule applies for instance when get the initial investment position in a Portfolio.
(Null values are ignored)

Type LinPack built-in Aggregation