Steps to reproduce :
Create a process "test_orderline" with a parameter :
DB ColumnName : C_OrderLine_ID
Reference : Search
Default Logic : @C_OrderLine_ID@
ReadOnlyLogic : 1=1
Now, add this process on the Toolbar button of the Sales Order Window (Lines tab).
(This has just been done on demo.idempiere.com)
Now, log in GardenWorld and open the Sales Order window.
Click on the wheel while the line tab is in detail position and select 'test_orderline' process.
The Param will be empty.
Now, if you set the Line tab as Master and launch the same process, the field will be filled.
also note a test case when fix it: when detail at collapsed status, detail record even don't load.
triaged by as reproducible in 7.1z