a derived grid is read-only: its rows are computed from another grid. Write to the source grid instead, and the derived one follows.

Warnings reference › source.derived.readonly

Identifier

source.derived.readonly

Raised by

The grid (core)

Since

1.10.0

What happened

A change was applied to a derived source. Its rows are computed, so there is nothing to write into and no way to invert the computation back onto the parent's rows: every operation in the change is rejected, and the rejections are reported back to the caller.

The fix

Write to the source grid; the derived grid recomputes from it.

Reference

Covered in full at the API reference.