Presence of adaptation parameter set units

An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• perform a conversion between a video comprising one or more pictures comprising one or more slices and a bitstream of the video,
• wherein the bitstream conforms to a predefined order between a position of a first network abstraction layer (NAL) unit in a picture unit carrying an adaptation parameter set (APS) information and a second NAL unit that is a last video coding layer (VCL) NAL unit in the picture unit.

A non-transitory computer-readable storage medium storing instructions that cause a processor to:

• perform a conversion between a video comprising one or more pictures comprising one or more slices and a bitstream of the video,
• wherein the bitstream conforms to a predefined order between a position of a first network abstraction layer (NAL) unit in a picture unit carrying an adaptation parameter set (APS) information and a second NAL unit that is a last video coding layer (VCL) NAL unit in the picture unit.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• generating the bitstream of the video comprising one or more pictures comprising one or more slices,
• wherein the bitstream conforms to a predefined order between a position of a first network abstraction layer (NAL) unit in a picture unit carrying an adaptation parameter set (APS) information and a second NAL unit that is a last video coding layer (VCL) NAL unit in the picture unit.