The GP October 2019 release gets and additional long description field in Payables Transaction Entry. One note, this doesn’t make the regular description longer. It’s a brand new field so you may need to add it to some of your custom reports. More details at the link.
Microsoft Dynamics GP – Long Description Field on Payables Transaction Entry – Microsoft Dynamics GP Community
Payables & ReceivablesMicrosoft & the GP Ecosystem
Archived post from 2019. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.