Error while updating editable fields

STR:
1.Publish procedure CLE
2.Upload clarification file
3.Try to patch 'minNumberOfQualifiedBids', 'minimalStep' fields

AR:
"message": "Forbidden. Fields ['minNumberOfQualifiedBids', 'minimalStep', 'sellingMethod'] are forbidden to update"

ER:
There should be possibility to update 'minNumberOfQualifiedBids', 'minimalStep' fields