Yes you could do this. Another option would be to sell the grain, after selecting the correct Vendor, date and description, for the dollar amount gifted (which would assign the proper sale price to the Crop Enterprise) when recorded through Income or Sales and click OK. Then use the Other Sales and Expense Reductions button. Enter a negative dollar amount matching the grain sale. Change account on left to Expenses and highlight your contribution expense account and click OK. Total Sales will then become zero. Record and Done.