How to remove relationship rule through SDK?

I have tried two ways to solve the problem like this:

the first one is:

row.setValue(ProgramConstants.ATT_RELATIONSHIPS_RULE, null);

the second one is:

Map map =new  HashMap();

map.put(ProgramConstants.ATT_RELATIONSHIPS_RULE_AFFECTEDOBJECT, null);

map.put(ProgramConstants.ATT_RELATIONSHIPS_RULE_AFFECTEDOBJECTSTATUS, null);

map.put(ProgramConstants.ATT_RELATIONSHIPS_RULE_CONTROLOBJECT, null);

map.put(ProgramConstants.ATT_RELATIONSHIPS_RULE_CONTROLOBJECTSTATUS, null);

row.setValue(ProgramConstants.ATT_RELATIONSHIPS_RULE, map);

but above two ways, they didn't work.

so now I using remove row, and adding back to clean this field.

Is there any function to remove rule through SDK?