Unless restricted by the district court, a supervised personal representative has, without interim orders approving exercise of a power, all powers of personal representatives under the [Uniform] Probate Code, but he shall not exercise his power to make any distribution of the estate without prior order of the district court. Any other restriction on the power of a personal representative which may be ordered by the district court must be endorsed on his letters of appointment and, unless so endorsed, is ineffective as to persons dealing in good faith with the personal representative.