Created CDS based value help for Document field, (DRAW-DOKNR) & enabled search capabilities for the same view by putting fuzzinessThreshold: 1 as per the business requirement. Now when user searches for a document eg: 68000000000000000001 ,by using standard filter results are not found, but results are found when user enters document number in internal format eg: 0000068000000000000000001.
Issue : document external format
Document internal format
But it working fine in both formats (intenral/external) ,when user searches with Document field filter instead of Standard filter.