Hi, all.
I am Hideaki Hagiwara in Japan.

I think that IDEMPIERE-5302 Drill Assistant is very useful function.
So, I tried to use some case.

And, I found that Drill Assistant show inappropriate error message at blank field.
*Error_Search.png

[How to Reproduce]
Step1: Create Drill Rule that process is constituted by RV_Order_Open. And set Business Partner to Process parameter.
*Drill rule.png

Step2: Open Sales Order Window

Step3: Show right click menu at blank Business Partner field. And select Drill Assistant.
*SalesOrder.png

Step4: Click Run report
*ClickRunReport.png

Reference of Process Parameter : Chosen Multiple Selection Search
Error message - for input string: "null"
*Error_ChosenMultipleSelectionSearch.png

Reference of Process Parameter : Search
Error message - Character n is neither a decimal digit number, decimal point, nor "e" notation exponential mark.
*Error_Search.png
*Parameter_C_BPartner_ID.png