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Missing header in ALV

I'm an SAP ABAP developer in the states and have recently developed a report using ALV. I used the function module REUSE_ALV_GRID_DISPLAY to display the output and this used to display header information that I passed, until just recently. I'm not sure what changes were made to the system but the entire source has not changed. I tried to debug and find why it's not displaying the header, but gave up after intensive hobbling around in debug. I changed the Function Module to REUSE_ALV_LIST_DISPLAY and it now displays the heading, but I'd still like to find out why.

Can you help?

It occurs to me that the REUSE_ALV_GRID_DISPLAY is for the ALV grid - the EnjoySAP control, but REUSE_ALV_LIST_DISPLAY is for the ALV. Perhaps that is why you are experiencing odd behaviour. Although the ALV Grid and the ALV are very similar in use, they are not the same.

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