Seeded Measure Exceptions: Days Expression

Summary

I need to know expression of measure Exception: Days. I will modify the expression to show maximum of Days past due rather than Sum of Days past due.

Content

We configured a tree graph Items with Past due Purchase Orders and 2 measures Exceptions: Quantity and Exceptions: Days (refer screenshot).

Above, Exceptions: Days is showing sum of Days Past Due column (refer screenshot below).

Note: Exception is Past due Orders.

In tree graph, User wish to see purchase order maximum due day (For the case shared in screenshot output expected is 57).

Duplicated Exceptions: Days measure and changed aggregation parameter for time and other dimension as Maximum.