RZL_SYSTEMWIDE_WPINFO Returns Value with * (asterisk)

Hello, we are currently creating a custom FM that will make use of the data from calling RZL_SYSTEMWIDE_WPINFO. However, we find that in the results from RZL_SYSTEMWIDE_WPINFO, the values returned have an *. What does the * mean?

We were expecting numbers for the following fields (although they are defined as characters but we assumed that their purpose is to provide a numerical value).

WP_NO                          CHARACTER       2

WP_ELTIME                      CHARACTER       6

Workprocess Number and Elapsed Time.

Thank you.