I have come across the problem that I am unable to write a cargo weight value.
In auto or when I eg. write a value it generates the maximum value and make a big red bar across the page: 
Payload/cargo limited by MZFW.
Hi,
SimBrief automatically adds ~25kg of baggage to the cargo by default, per passenger. This can be customized in the custom airframe options.
The “Freight” option is for adding additional cargo on top of the passenger baggage.
It simply isn’t possible to fit 204 passengers (at 84 kg each), plus 204 bags (at 25 kg each), plus another 2,000 kg of freight on a 737-900.
The message is simply alerting you that not all of your requested freight/cargo could be boarded due to the MZFW. You asked for a total of 7,089 kg in the cargo (5,089 for baggage and 2,000 worth of freight), but only 4,613 kg could be boarded:
Best regards,
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