Hello. I am trying to modify the following CSL file

https://github.com/citation-style-language/styles/blob/master/din-1505-2-alphanumeric.csl

since it doesn't provide a year disambiguation method if an author posts two works within the same year. For me, the examples are:

```yaml
OverlappingDiv:
type: article
title: On Overlapping Divergences
author: Kreimer, Dirk
date: 1999
page-range: 669-689
url: https://doi.org/10.1007/s002200050661
serial-number:
doi: 10.1007/s002200050661
issn: 0010-3616
parent:
type: periodical
title: Comm. Math. Phys.
issue: 3
volume: 204

ChenIterated:
type: article
title: Chen's Iterated Integral Represents the Operator Product Expansion
author: Kreimer, D.
date: 1999
page-range: 627-670
url: https://doi.org/10.4310/ATMP.1999.v3.n3.a7
serial-number:
doi: 10.4310/ATMP.1999.v3.n3.a7
issn: 1095-0761
parent:
type: periodical
title: Adv. Theor. Math. Phys.
issue: 3
volume: 3
```
so currently they both come out as [Kre99]. I got it working for citations by modifying:

```xml



(added this)

```
and so entries come out looking like [Kre99a] and [Kre99b], but I can't get the associated bibliography entries working. The closest I've gotten is:

```xml











```
but in my case, this outputs

[Kre99 b] Kreimer, D.: Chen's Iterated Integral Represents the Operator Product Expansion. In: Adv. Theor. Math. Phys. vol. 3 (1999), No. 3, pp. 627–670

and not

[Kre99b] Kreimer, D.: Chen's Iterated Integral Represents the Operator Product Expansion. In: Adv. Theor. Math. Phys. vol. 3 (1999), No. 3, pp. 627–670

where "b]" is being treated as part of the actual bibliography entry. I cannot figure out why.

Any explanation and help is greatly appreciated.