How to set null value in reference control on a Form

Below are the ways to blank or clear the reference control. This is kind of tricky, it is not as simple as other controls. Remember I did mention reference control in one of my previous post with name “How to add lookups”

ABCTable _ds.object(fieldNum(ABCTable, Field1)).setValue(0);

ABC_ds.rereadReferenceDataSources();

Or

ABCTable _ds.object.Field1 = 0;

ABC_ds.rereadReferenceDataSources();