Let’s use the tools in the system instead of going straight to code. In this case you can use Extended Properties Maintenance to change this as long as @jgiese.wci said the DB Supports it.
Simply open Extended Properties Maintenance and lookup the corresponding DataSet, you can find the data set by using an Epicor Trace in this case the DataSet is called: InventoryQtyAdj
Then simply update the format to x(1000) for example to expand the field to 1000 characters and save.
Open up Quantity Adjustment Screen and Profit. You don’t even have to close Epicor. 
