[RESOLVED] Crystal formula help please

Thanks to all who helped me in the past

I use a formula field to print a message only when items are all packed into one carton

if {Despatch.Type} = "OverPack" then

if {Despatch.caseno} = "" then
""
else "All packed in carton #" & {Despatch.caseno} & Sum({Despatch.weight}) & " kg"

Should print the weight for items inside a particular carton after the contents list for each carton only if packed together.

All Packed in carton #1 7 kg

All Packed in carton #2 4 kg

All Packed in carton #3 3 kg

I have placed the formula in the group Footer (grouped by despatch.caseno)
but it still prints the total weight of all items against each carton like

All Packed in carton #1 14 kg

All Packed in carton #2 14 kg

All Packed in carton #3 14 kg

When Items are sent unpacked then the weight gets printed next to the items like
2 x Monitors 6 kg
3 xPrintwers 2.5kg
This works OK

Alternatively i can use formula field

if {Despatch.Type} = "OverPack" then

if {Despatch.caseno} = "" then
""
else "All packed in carton #" & {Despatch.caseno}

AND insert a summary field in the group footer But need then to suppress the summary field if not packed together

Either way I need some help please
PS. How do I flag a message when resolved?