The Form 483 details three observations flagged by US Food and Drug Administration (FDA) investigator Brian Nicholson, who visited the site in April.
The issues relate to quality control, manufacturing equipment and procedures designed to prevent microbial contamination that are used in vial filling activities at the site.
Akorn did not respond to a request for comment about the latest Form 483.
Fresenius Kabi is due to acquire Akorn for $4.3bn in a transaction expected to close before the end of the year.
A spokesman for the German firm told us "We are well aware of this issue [the Form 483]"
He added that "Both companies fit very well together. As soon as the deal has been closed, we will start working with our new colleagues on further developing the joint businesses."
Akorn operates a second manufacturing facility on Wyckles Road in Decatur. The Form 483 does not relate to this facility.
The original article incorrectly stated that Fresenius Kabi's acquisition of Akorn will complete early next year.