Why is it not possible to filter with wildcards (*) in columns with conversion exits?
When you use the filter function in the ALV, conversion exits are taken into account. These conversion exits convert the external value that was entered into the relevant internal value. The data table is then filtered with the internal values. If you enter a wildcard instead of a correct external value in the filter dialog box, it is unclear which internal value should be matched to this confusing value (see also Note 1024501). The conversion exit may return an error message.
