R/exams: Negative Points / Deduction not working for incorrect Numeric Answers

I created quizzes in r/exams that contain "num" and "string" Answer fields which I am using in Moodle. I would like to give negative points (e.g. -0.25% of the possible points for that answer) for incorrect answers. In theory there are functions in r/exams that allow this (exams_eval), but for me they only work in choice questions, not in numeric questions. I also tried different "rule" settings and variations of the r/exams command but did not got it working. Are negative points not possible for numeric exams? R/exams Command: ``` exams2moodle("example.Rmd", cloze = list(eval = list(partial = TRUE, rule = "false", negative = -0.25))) ``` Rmd Code (actual code is more complicated, this is just an example for numeric answers): ``` `{r data generation, echo = FALSE, results = "hide"} a <- 1 b <- 2 n = a + b m = a * b sol <- c(n, m) ` Question ======== Calculate the results of the following tasks: `r a` + `r b` = ##ANSWER1## `r a` * `r b` = ##ANSWER2## Solution ======== The solution is: `r a` + `r b` = `r n` `r a` * `r b` = `r m` Meta-information ================ extype: cloze exsolution: `r paste(sol, collapse = "|")` exclozetype: num|num extol: 0.01 ```