Conflict resolution in versioned tables
Conflicts are automatically detected when a merge or refresh operation is requested, and they are presented to the user in conflict views. There is one conflict view for each table.Each conflict view has a name in the form table_name_CONF. 
To keep the rows that you want, first of all let me show you the syntax of ResolveConflicts procedure.
DBMS_WM.ResolveConflicts(
   workspace     IN VARCHAR2,
   table_name    IN VARCHAR2,
   where_clause  IN VARCHAR2,
   keep          IN VARCHAR2);


You can use 'keep' parameter to decide on which(Parent, Child or Base) to resolve the conflicts. 

In your case you have define 'CHILD' for keep parameter. And where_clause(ID=1 in your case) identifies the rows to be refreshed . Your procedure resolves conflicts involving rows in the SOME_TABLE table in W_CHILD where ID is 1, and uses the values in the child workspace to resolve all such conflicts. 
For details visit Oracle documentation:DBMS_WM Package: Reference