sp_MSvalidate_dest_recgen (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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Definition:

sys.sp_MSvalidate_dest_recgen(uniqueidentifier @pubid
, uniqueidentifier @recguid
, bigint @recgen)

MetaData:

 CREATE PROCEDURE sys.sp_MSvalidate_dest_recgen @pubid uniqueidentifier, @recguid uniqueidentifier, @recgen bigint as  
begin  
    declare @retcode int, @has_subbased bit, @has_downloadonly bit, @is_publisher bit, @min_sentgen bigint  
      
    exec @retcode = sys.sp_MSrepl_PAL_rolecheck @pubid=@pubid  
    if @@error <> 0 or @retcode <> 0  
        return 1  
      
    select @has_subbased = 0, @has_downloadonly = 0, @is_publisher = 0  
      
    exec @retcode = sys.sp_MSvalidatecommongen @commongen = @recgen, @commongenguid = @recguid  
    if @@error <> 0 or @retcode <> 0  
        return 1  
      
    if exists (select distinct * from dbo.sysmergepartitioninfoview   
                where partition_options = 3  
                and pubid = @pubid)  
        select @has_subbased = 1  
                 
     if exists (select * from dbo.sysmergepartitioninfoview smpi1  
                    where (upload_options = 1 or upload_options = 2)  
                    and pubid = @pubid)  
        select @has_downloadonly = 1  
          
    if sys.fn_MSmerge_islocalpubid(@pubid) = 1  
        select @is_publisher = 1  
          
    if @is_publisher = 1  
    begin  
        if @has_subbased = 1 or @has_downloadonly = 1  
        begin  
            select @min_sentgen = isnull(min(sentgen),0) from dbo.sysmergesubscriptions  
            where pubid = @pubid   
            and subid <> @pubid  
              
            if @recgen < @min_sentgen  
            begin  
                RAISERROR(21800 , 16, -1)  
                return 1  
            end  
        end  
    end  
    else  
    begin  
        if @has_subbased = 1  
        begin  
            select @min_sentgen = isnull(min(sentgen),0) from dbo.sysmergesubscriptions  
            where pubid = @pubid   
            and subid = @pubid  
              
            if @recgen < @min_sentgen  
            begin  
                RAISERROR(21800 , 16, -1)  
                return 1  
            end  
        end  
    end  
      
    if exists (select * from dbo.sysmergepublications where isnull(retention,0) = 0)  
        return 0  
      
    declare @curdate datetime, @cutoffdate datetime  
      
    select @curdate = getdate()  
      
    select @cutoffdate = min(sys.fn_subtract_units_from_date(isnull(retention,0), retention_period_unit, @curdate))  
    from dbo.sysmergepublications  
          
    if @recgen = 0 or exists (select * from dbo.MSmerge_genhistory where generation = @recgen and coldate <= @cutoffdate)  
    begin  
        RAISERROR(21800 , 16, -1)  
        return 1  
    end  
      
    return 0  
      
end