Thanks Selva we got BASIS to increase memory to 8G and still it fails. This is actually a Material master data report with plenty attributes of Material and other dimensions aka 'number of columns' almost a 100 which seem to be the issue
Also BEx query/RSRT, Analysis run the query okay however the query didnt have all 100 cols as in Webi (webi has the attributes expanded in Material r Material number dimension apart from other dimensions)
Please provide your inputs
Kris