MXModelReflection shows your microflow without output type integer. The selection form is constrained by paths based on type. You can either
Make the from MicroFlow_View editable and change the output to Long. You will have to do this everytime after syncing the objects.
Remove the 1st constraint from Column_NewEdit ReferenceSelector1 ('Parse with' 2nd column)
or Change MxModelReflection that every microflow with output integer is also added with output Long.