Steps to reproduce:

• define correctly DataField and Mining Field
  • DF ("test1", String, Categorical), ("test2", String, Categorical)
  • MF ("test1", "test2")
  • see "Definition_DD_and_MS" attachment
• go back to DD and clean it (see "No Data Fields Defined")
• go to Mining Schema

Actual result:

Mining Schema is emty and the editor shows "Some items are invalid and need attention." validation error. Only way how to find out what is wrong is to use PMML Source code to see which DF is missing. See "MiningSchema_delete_all_DFs" attachment

Expected result:

See all Mining fields and for each row there should be some validation error. See "MiningSchema_delete_DF_test2" attachment.