The Inventory Item Descr field is 255 characters. It is automatically copied to the CROpportunityProducts.TransactionDescription field, and truncated because that field is only 60 characters long.
We implemented a customization to increase the length in 6.1; in 2018R1 this field is eliminated and changed to Descr. Our customization is unable to be published without modification for the field change in 2018R1, unless we truncate the data.
Please match the field sizes between Descr fields so this customization is unnecessary.