How to display two detail lines as one

Question

In a report I am working on I have a detail line that displays values from two tables.
Table OR contains the date time stamp I need
Table OB contains the rest of the information I need. 
(These two tables are linked by a Set_Id field.) 
Table OB contains different types of data depending on the OB_Id field. 
If OB_Id = 1 then OB_fldA = weight. 
If OB_Id = 2 then OB_fldB = appetite_flg. 
Below I have tried to type up a sample of the report.  I have it grouped by the OR_DtTm.
I would like to get the report to look like there is one line that contains both the weight and the appetite_flg and eliminate any lines that have weight info and no appetite_flg to go with it (like the 3rd one down with the time of 3:45:30). 
How it currently looks:
Date        Weight         Flg         OR_DtTm
6/22/2010   64.8                    6/22/2010 3:44:31PM
6/22/2010    0.0            N       6/22/2010 3:44:31PM
6/22/2010   64.0                    6/22/2010 3:45:30PM
8/3/2010    64.0                    8/3/2010 9:09:01AM
8/3/2010                    Y       8/3/2010 9:09:01AM
How I would like for it to look:
Date         Weight         Flg         OR_DtTm
6/22/2010    64.8            N        6/22/2010 3:44:31PM
8/3/2010     64.0            Y        8/3/2010 9:09:01AM
I hope this makes sense.  Any suggestions on how to do this?

Answer 1

Hey Brian,
Now that I have the Maximum formulas working on my Group Footer, I need to figure out how to supress when the MaxAppetiteFlg is not there.  In the Section Expert on the Group Footer I clicked the x+2 button and put this:
{@MaxAppetiteFlg} = "" or {@MaxAppetiteFlg} = " "
but it still does not suppress when nothing is in the MaxAppetiteFlg. I have tried single quotes and double quotes; I have tried checking for just null and for just space and as shown above for both.  Nothing suppresses the group footer when the MaxAppetiteFlg is blank/empty.  What actually goes into the formula?
Ok, let me back up a little. I don't think this makes a difference but you never know.  I am going to explain the steps preceeding the creating of @MaxAppetiteFlg.  It's a little more complicated than I originally indicated (I removed the complexicity to hopefully make it easier to understand my original question).
Originally I said:
If OB_Id = 2 then OB_fldB = appetite_flg
Actually it is
OB_Id = 2 is part of the filter in the Select Expert.  Then I created a formula:
DecreaseAppetiteInd =
     If {OB.Ob_fldB = 22474 then
          'N'
     Else If {OB.Ob_fldB = 22475 then
          'Y' ;
Then MaxAppetiteFlg =
     Maximum ({@DecreasedAppetiteInd},{Ob_DtTm})
So I don't know if that makes a difference in later checking MaxAppetiteFlg (but I didn't think it would make a difference whether I had changed the options on the group but it did).
I hope all this makes sense and I haven't muddied the water too badly.
I look forward to your response.