As the subject say, when Dutching horse racing (only I've checked), then the Green Up button are N/A
Should it be so, or is it a bug?
Dutching - Green All = N/A
Its disabled by default as it is often not recommended to try and green up if dutching, you can enable it at your own risk by going into;
Settings > Edit Settings > Green Up and unticking ‘Green Up Restriction’
Settings > Edit Settings > Green Up and unticking ‘Green Up Restriction’
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