Display Help for Field not referred through Data Elements in ALV

Hi,

I am working on a report program where the output is in ALV_LIST display format.The internal table used to define the field catalog contains fields that are not declared using Data elements.For these fields, when i press F1 from the output, the message I receive is 'No Document Available'.Can someone tell me how I can attach a help document to these fields without creating a new data element for each of these fields....

For eg : My internal table that forms the field catalog is

Data : Begin of i_itab occurs 0,

matnr like mara-matnr,

Name(50),

end of i_itab.

When this table is displayed in ALV, if F1 is pressed on the field matnr the corresponding dictionary help pops out.But since the field Name has no help document attached to it, i cannot view any help for this..Kindly tell me how i can attach my own help document to this field.

Thanks,

Swathi