Unable to save the key figure's "unit of measure" in PA

Dear all,

Exactly I am facing with this issue with below 2 key figures.

Key figure Unit of measure

Working Days u2013 D

YOY Pricing %-- %

When I enter these units in the Unit of Measure column in the keyfigure tab details in PA , system does not SAVE these units that is the problem.

1. working days/yoy pricing % key figure can be configured as a number keyfigures and data type DEC.

I AM USEING SCM 7.0 SUPPORT PACKAGE 004

can you pl provide some hints.