Implement the below OSS notes to resolve your problem.
2689410 - RF - Putaway is not possible with nested HUs
Version 1
Type: SAP Note
Language: English
Master Language: English
Priority
Correction with high priority
Category
Program error
Release Status
Released for Customer
Released On 11.09.2018
Component SCM-EWM-RF-PUT ( Putaway )
Please find the original document at
https://launchpad.support.sap.com/#/notes/ 2689410
Symptom
Start RFUI with logical transaction putaway. You work with nested HUs. When you try to leave the nested HU screen by choosing pushbutton 'F1 Save' then the following error message is triggered: "Actual Quantity is not equal to planned quantity"
Other Terms
/SCWM/RFUI /SCWM/RF_EN400 /SCWM/RF_EN 400
Reason and Prerequisites
Code error
Solution
Implement the attached code corrections or import the appropriate support package