EXHIBIT 10.4 LETTER AGREEMENT AMENDING THE LOAN AGREEMENT Overton Bank & Trust, N.A. South Arlington Office Curtis F. Von Der Ahe President December 12, 1996 Mt. Tom Hoefert, CFO InnoServ Technologies, Inc. 4330 Beltway #300 Arlington, Texas 76018 REFERENCE: LOAN AGREEMENT DATED DECEMBER 15, 1995 COVENANT VIOLATIONS - --------- Dear Mr. Hoefert, You have indicated that you are in violation of the Minimum Tangible Net Worth covenant as outlined in the loan agreement referenced above. We hereby waive compliance with this covenant thru October 31, 1996 and re-set this covenant as follows: Minimum Tangible Net Worth $4,500,000 If you require anything else, please do not hesitate to call. Sincerely, /s/ Curtis F. Von Der Ahe Curtis F. Von Der Ahe President