Thanks a lot for the very useful [GroupByLoopStart] node . To my eyes, this node could be included in the standard knime distribution. It is working fine for me in most of the time. But sometime I encounter this error message that stop my process:
Unable to merge flow object stacks: Stack can't be merged: Conflicting FlowObjects:org.knime.core.node.workflow.FlowLoopContext@18225f9 vs. org.knime.core.node.workflow.FlowLoopContext@18b0b84
The problem comes from the fact that when you use a lot of [Java IF] node without [End IF] node the GroupByLoopStart node gets confused.
I create a surrogate workflow that solve this issue in my case, but I find your solution more elegant and simple. Do you mind to have a look at this problem?
In advance thanks for you help in finding a fix.