Integration

Hi,

Im trying to add 1 day to a date in a BPEL proces. I saw that there was a xp20:add-dayTimeDuration-to-dateTime so I tried using this in several ways. I didnt expect the input variable to be a string. I tried converting my date to a string and adding 1 day like this:

xp20:add-dayTimeDuration-to-dateTime(xp20:format-dateTime(string(bpws:getVariableData('inputVariable','payload','/ns1:GereedMeldenRoosterRequest/StartDatum')), 'YYYY-MM-DD'), 'P1D')

But the variables which I try to fill stays empty. The element which I try to fill is of type dateTime. Is this maybe the error that add-dayTimeDuration-to-dateTime returns a string and it cannot cast it to dateTime?

Can anyone tell me how to solve this properly?

Thanks in advance!