请问各位这段，有否语法错误？

[kinny_ke]

select * from e_cust_cust
SCAN
IF seek(vcustomer.cst_code,'e_cust_cust','cst_code')
IF !e_cust_cust.approve
IF messagebox("该记录已经审核，您是否要取消审核？",4+48,"系统提示信息")=6
this.value=.f.
ELSE
this.value=.t.
ENDIF
ENDIF
ENDIF

[流星尔]

select * from e_cust_cust into cursor lsb
sele lsb
loca for cst_code=vcustomer
if !approve
if messagebox()
....
endif