gistfile1.txt

create table t1 {
schema
	{
		int i 
	}
keys
	{
		"idx1" = i 
	}
} $$

create table t2 {
schema
	{
		int i 
	}
keys
	{
		  "idx2" = i 
	}
constraints
	{
		"fk" = "idx2" -> <"t1":"idx1"> on delete restrict
	}
}$$

insert into t1 values(1);
insert into t2 values(1);
delete from t1;
[delete from t1] failed with rc 3 verify key constraint cannot resolve constraint table 't1' index '0' key 'IDX1' -> table 't2' index '0'