ORA-02292: integrity constraint FK_CUR_LOC violated - child record found

CREATE TABLE "NMKGL"."USER_LOC" 
   (	
    "ID" VARCHAR2(25 CHAR) NOT NULL ENABLE, 
	"LOC" NUMBER(9,0) NOT NULL ENABLE, 
	"DELETION" NUMBER(4,0) DEFAULT 0 NOT NULL ENABLE, 
	"PARENT_ID" NUMBER(9,0), 
	 CONSTRAINT "PK_USER_C_L" PRIMARY KEY ("ID", "LOC")
	 CONSTRAINT "FK_CUR_LOC" FOREIGN  KEY ("L_ID") REFERENCES "KLMOP"."LOC" ("L_ID") ENABLE
   )