Cannot delete computers from WSUS

hello all,

i unable delete number of computers in our wsus environment,

whenever try remove these computers gui crashes , have reset it, if try delete operation in powershell following:

exception calling "delete" "0" argument(s): "the delete statement conflicted reference constraint 
"fk__tbexpande__targe__1881a0de". conflict occurred in database "susdb", table 
"dbo.tbexpandedtargetintargetgroup", column 'targetid'.
statement has been terminated."
@ line:1 char:1
+ $targets[0].delete()
+ ~~~~~~~~~~~~~~~~~~~~
    + categoryinfo          : notspecified: (:) [], methodinvocationexception
    + fullyqualifiederrorid : sqlexception
 

what think has happened these machine have relationship computer target group no longer exists. don't know how happen, cleanup our group structure , think issue related that. 

hello all,

i have run out of time try , resolve issue have decided rebuild wsus instance scratch. thank help.

Windows Server  >  WSUS