Negative product qty with "-" is not valid in admin panel product page

[HellgaM]

Negative product qty with "-" is not valid even if "backorder" is enabled
https://drive.google.com/a/interiorwebdesign.com/file/d/0ByJDgAmB3zgAYk0tQmRhVnZWNms/view?usp=drivesdk

Preconditions

Magento version is 2.1.0
PHP 7
MySql 5.6

Steps to reproduce

1. Open product in admin panel
2. Set inventory "-8"
3. try to save product

Expected result

1. Value with "-" should be valid

Actual result

1. Can't save the product because of not valid qty

[Sanfam]

Additional note: While Magento appears to be able to track negative inventory counts and can even export this data as part of a comprehensive Product Data Export, but will error out when attempting to import these negative qty values (regardless of whether or not inventory tracking or backorder are enabled)

[odubovyk]

@HellgaM, thank you for the report. Internal ticket MAGETWO-60216.

[joshdavenport]

Have recently experienced this issue with a client and it sure is a pain. Even setting backorder settings "Allow qty to below 0" which based purely on the language would lead you to believe a negative qty would be valid. Worth noting: setting allow qty decimals allows you to save with a negative qty but that feels hacky.

[Tristan-N]

@odubovyk Do you have any updates for us? Or any kind of temporary workaround? Thanks

[rganin]

Issue is fixed in MAGETWO-57052 for 2.1.