Incremental seek/filter functionality depends on the underlying datasource's seek capabilities.
If you are using Dolphin, the limitations are due to oQry:Seek( .. ) method.
If you are using FWMARIADB, you should be able to use incremental seeks with date and numeric fields also.
Solutions:
1) Improve oQry:Seek method for your neeeds.
2) Set oCol:cSortOrder of date and numeric columns to nil. In that case these columns are not sorted
3) Modify dolphinseek() function in xbrowse to return .f. when the sorted field is numeric or date
4) Use FWHMariaDB
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