HP MLIB User's Guide Vol. 2 7th Ed.

Chapter 5 Fast Fourier Transforms 555
Three-dimensional FFT S3DFFT/D3DFFT
ier = 0 Normal return—transform successful.
ier = −1 l1 ≤ 0.
ier = −2 l2 ≤ 0.
ier = −3 l3 ≤ 0.
ier = −4 ldxy < l1.
ier = −5 mdxy < l2.
ier = −6 Probable error in ldxy or mdxy.