Dump using REUSE_ALV_GRID_DISPLAY

This is the dump that occurs using REUSE_ALV_GRID_DISPLAY

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You attempted to access an unassigned field symbol

(data segment 32771).

This error occurs:

- if you address a typed field symbol before it has been set with

ASSIGN or

- if you address a field symbol that has been reset with UNASSIGN

or pointed to a local field that no longer exists, or

- if you address a field symbol that pointed to a line of an internal

table that has now been deleted, or

- if you address a global function interface partameter, even

though the relevant function module is not active,

i.e. it is not in the list of active calls. You can get the list

of active calls from the this short dump.

How to correct the error

If the error occurred in a non-modified SAP program, you may be

able to find a solution in the SAP note system.

If you have access to the note system yourself, use the following

search criteria:

"GETWA_NOT_ASSIGNED"

"CL_GUI_ALV_GRID===============CP " or "CL_GUI_ALV_GRID===============CM02A "

Can neone sugest how to correct it