performing a conversion between a video comprising one or more pictures and a bitstream of the video,

wherein the one or more pictures are included into the bitstream according to a first order rule,

wherein the first order rule specifies that in response to a first condition being satisfied, the bitstream does not include any picture, which precedes, in an output order or a decoding order, an intra random access point (IRAP) picture preceding a current instantaneous decoding refresh (IDR) picture in the decoding order and is referred to by an entry in a reference picture list for a current slice of the current IDR picture,

wherein the first condition comprises that a presence flag in a sequence parameter set level related with IDR reference picture list syntax elements is equal to a predefined value, and

wherein the current IDR picture comprises one or more IDR subpictures, wherein the bitstream conforms to a second order rule, wherein the second order rule specifies that in response to a second condition being satisfied, the bitstream does not include any picture referred to by an entry in a reference picture list for a current slice of a current IDR subpicture that precedes, in the output order or the decoding order, any picture that contains an IRAP subpicture and precedes the picture containing the current IDR subpicture in the decoding order.