Hi Carsten,
Thanks for using Syncfusion products.
We have checked your shared project. But, unfortunately we are unable to reproduce your reported issue. In autocomplete multiple column search is based on ‘searchColumnIndices’ property. In below sample, searching based on first three columns using searchColumnIndices property. If you enter ‘t’ text in autocomplete, it will search first three columns with the text ‘t’ and filter that four data’s and shown a suggestion list with four data’s. Please find the below screenshot.
We have used your shared code and prepared a below sample.
In a post back, I get where query predicates properly based on searchColumnIndices property after search any text in autocomplete. In this below attached sample, the you have used first 4 column indexes, So searching based on first four columns and where predicates are passed correctly. Please find the below video for your reference.
If still face issue, please provide more exact details of your issue or please share video with your issue. So, that we can check and provide solution at earliest.
Let us know If you have any queries.
Regards,
M. Balaji