Design Studio 1.6.4.2 Planning in Crosstab - Entries appear in wrong line

Hi experts,

I have the following problem with DS: When I use an input-ready crosstab that has "number of new lines" set to 5 and has no data in it yet, entries appear in the worng line, meaning I enter data in the first line but the entries appear in the second line. Checking the input values via Planning.recalculate() then leads to an error. The system seems to behave fine once data is available for the underlying data source.

Browser: ie11, application UI5m.

Any ideas how to fix this?

Thanks in advance, Thomas