External Loans Given - Setup Errors

Hello experts - Our Treasury squad has acceptable up outer loans fixed (33A) successful the SAP ECC Treasury module.  One is simply a 4-year USD declaration with repayment benignant of annuity with acceptable monthly payments (interest based connected anterior months main balance/remainder applied to principal).  They could make the declaration connected QA but were not capable to spot the divided betwixt involvement and principal, truthful they attempted to station the archetypal disbursement and received this error.   Do you cognize what config we are missing?