Hi all
For your references, the issue was already been resolved by the following procedure below. please refer on this link for references.
Procedures :
1.Click Start, click Run, type ADSIEdit.msc, and then click OK
2.Expand the Domain Naming Context container.
3.Expand DC=Your Domain, DC=COM
4.Expand CN=System.
5.Right-click the Trust Domain object (childDC. domain.com), and then click Delete
7.Right-Click CN=Users--> CN=child domain$ and then Delete. If not deleted (no problem follow next step)
8.Go to ADSI edit in administrative tools
9.Right click ADSI Edit ->connect to Domain's Naming context" configuration" then click ok
10.Cofiguration-->CN=configuration,DC=your domain,DC=com -->CN=Partitions
11.Select and Delete Name: CN=your child domain /Directory partition Name: DC=child domain,DC=com
12.Now check Active Directory Domain and Trust (child domain entry would be removed)
Thanks