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We do not present here a scientific or technical justification for incoherent dedispersion limits however rudimentary calculations based on the residual dispersive smearing in a single frequency after fine channelisation by between 1k and 64k channels shows the following to be reasonable:  \begin{itemize}  \item \textbf{SKA1-SYS\_REQ-XXXX:} \textit{\bf SKA1\_Mid Pulsar Timing incoherent dedispersion DM limits.} The SKA1\_Mid when in pulsar timing mode shall time pulsars using incoherent dedispersion up to a dispersion measure of 6,000 pc cm${^-3}$. cm$^{-3}$.  \item \textbf{SKA1-SYS\_REQ-XXXX:} \textit{\bf SKA1\_Low Pulsar Timing incoherent dedispersion DM limits.} The SKA1\_Low when in pulsar timing mode shall time pulsars using incoherent dedispersion up to a dispersion measure of 1,000 pc cm${^-3}$. cm$^{-3}$.  \end{itemize}   
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