When clicking on the Destination button you can make the following settings.

XU_qlik_destination_settings

Date Conversion

Convert invalid dates to
Every invalid value will be converted into this value. NULL is supported as value.
You should set this value to be used in case of non convertible date values.
During the conversion of invalid SAP dates the two specific cases 00000000 and 9999XXXX will be checked at first.

Convert 00000000 to
Converts all SAP date 00000000 to the specified value.

Convert 9999XXXX to
Converts all SAP date 9999XXXX to the specified value.