Hi! Dealing with graded manifolds, I would like to define a graded coordinate of degree 1, denoted

$\xi_{a}$

and the associated partial derivative

$D_{a}$

of degree -1 (position of indices is unimportant for my purpose).

In particular, both

$\xi_{a}$

and

$D_{a}$ are self-anticommuting and anti-commuting with each other (being both of odd degree).

However, when I implement the situation in the following way:

```
{a, b, c, d, e, f, g, h, i, j, k, l, m, n ,o, r,s,t,u,v,w,x,y,z#}::Indices(T, position=free, parent=double);
D{#}::PartialDerivative;
{\xi{#}}::Depends(D{#});
{D{#},\xi{#}}::AntiCommuting;
{D{#},\xi{#}}::SelfAntiCommuting;
Exp:=D_{a}{D_{b}{\xi_{c}}*\xi_{d}};
product_rule(_);
```

the above leads to

$D_{a b}{\xi_{c}} \xi_{d}-D_{b}{\xi_{c}} D_{a}{\xi_{d}}$

where the second sign is wrong, since

$D_{b}{\xi_{c}}$

should be of degree 0, and then commute with

$D_{a}$.

Is there a way to fix this?

Thank you for any information!