Summary

When using fsl.FNIRT you have to set fieldcoeff_file=True in the inputs even when the fieldcoeff_file output is connected to a downstream node.

Actual behavior

No fieldcoeff_file is written and the downstream node errors out.

Expected behavior

Shouldn't there be an association between the input and output traits fieldcoeff_file be written with a default filename and passed to the downstream node? It's been so long that I've dealt with the Interface guts that I forget how this works ...