ORA-00984: 列在此处不允许 SQL parse error location

ORA-00984: 列在此处不允许
SQL parse error location

错误：

INSERT INTO ZP_CDC.T_WEBCHAT_QUOTATION (ID, QUOTATION_ID)
VALUES (SEQ_T_WEBCHAT_QUOTATION.nextval, " aaa");

正确：

INSERT INTO ZP_CDC.T_WEBCHAT_QUOTATION (ID, QUOTATION_ID)
VALUES (SEQ_T_WEBCHAT_QUOTATION.nextval,'aaa');