How To Insert Unique Composite ID For Hierarchical Table (SQL Server) -

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I have this table structured as follows: 

  PK ParentPK ID1 tap For the above table, I already have a function that can produce the following result:  
 >  PK FullID3 ABC5ADE  
 
 This function takes the rows of children who do not have children and for every line their parents are completely full-moon Generate. 
 
 Enter a string of full-width users to my application, such as "BEF", "ABD", and press Save button and its application fee for a suitable hierarchy structure (which consists of several rows) Parsed internally and put them in the table. 
 
 The question is, how can the application guarantee the fullness of Purni? I need to be able to reject the duplicate fullsigned by users. 
 
 I understand that I can check the fullness before using my function, if it is not present, then I can get involved. But if these steps are done in non-nuclear operations, then I can be used to access a heavy traffic in the duplicate full ID. 
 
 Should I wrap it in a stored procedure? Using Start / Commit Transaction Block? Or is there a better way to do this? Thanks a lot.

So you're looking for something like this 

  BEGIN TRAN If not present (choose one .pk from GetPullID (a.PK)) - Start operation - End TRAN

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