请问高斯100创建外键时报这个错时什么原因?

[2020-01-19 11:45:25.279 CST] : [ERROR] 执行失败
错误代码：[0]SQL错误码: = 28000
errorCode=GS-00601
errLine = 2
errColumn = 26
errMsg=Sql syntax error: FOREIGN KEY is not allowed on COORDINATOR
ioClient:@1b0dad1a
sql = alter table T_TESTF 
add constraint P_A_FK_ID foreign key (F_C) 
references T_TESTG (A)
Line Number: 22