MXC Customer Management Page- marking invoice as UnCollectible not functioning

Login to MMS and click the embedded link (https://inform.jatesting.cfahome.com/MMS_Stores_ExternalSite.aspx?url=/Financial/CustomerManagement&hideStoreSelector=true&MenuCustomItemID=472)
Select store 00198
OR login to Mobile , select store 00918 and navigate to https://m.inform.jatesting.cfahome.com/#/Financial/CustomerManagement
Search for Customer ACME Fruit Stand
Select the Uncollectible check box
Click Save

Expected: Balance should be reduced by invoice amount displayed in the Balance column
Also other backend logic will occur.

Actual: Save does nothing