Since July 20, 2021, users may receive an error like:
A GET request for this endpoint must have a $filter parameter with one of the following fields in the url:
for a variety of Exact Online tables. This is due to changes in the Exact Online APIs including mandatory filtering as described on Impact Exact Online API aanpassingen 1 juli 2021 (Dutch).
For resolution upgrade to 20.1.497 or newer. This BETA resolves most issues with mandatory filtering.
Currently one issue remains due to some awkward behavior of the mandatory filters (an example can be found on Itgeneor335 Statement caused an error. A required filter is missing). This issue will be fixed shortly.