I'm trying to use the following formula, but am getting the error application defined or object defined error. I have a feeling it's due to the line break, but it looks good to me.
ActiveCell.FormulaR1C1 = _
"=IF(AND(R[1]C[-13]=RC[-13],R[1]C[-15]=RC[-15]),IF(AND(R[1]C[-8]=RC[-8],R[1]C[-3]<>RC[-3]),IF(AND(R[2]C[-8]=R[1]C[-8],R[2]C[-3]<>R[1]C[-3]),IF(AND(R[3]C[-8]=R[2]C[-8],R[3]C[-3]<>R[2]C[-3]),IF(AND(R[4]C[-13]=R[3]C[-13],R[4]C[-15]=R[3]C[-15]),"""",RC[-3]),IF(AND(R[3]C[-13]=R[2]C[-13],R[3]C[-15]=R[2]C[-15]),"""",RC[-3]))," & _
"IF(AND(R[2]C[-13]=R[1]C[-13],R[2]C[-15]=R[1]C[-15],"""",RC[-3])),""""),IF(RC[-3]="""","""",RC[-3]))"