A study is a project with the goal to investigate something.
The construct 'has funding source' some ('has role' some funder) is necessary, because has funding source has the range has role some funder. This range comes from issue https://github.com/OpenEnergyPlatform/ontology/issues/850 : funding source is some kind of independent continuant, i.e. a organisation or person, that does something special (giving money). So it is anything that has role some funder.