Step 1: Identify the Document Used for the Write-Off
The inventory may have been written off using “Inventory Write-Off” document (Warehouse - Stocktaking documents - Inventory Write Offs).
Example:


It might be checked with Stock Balance by Warehouse report (Warehouse - Reports - Stock Balance by Warehouse) with filtering by Warehouse, Entity, Item (Batch and Characteristics if needed):

Cancel the document posting — open the document and click More Actions - Cancel Posting.

2. Review and correct the data if necessary, and either:
Edit the document, or Delete the document (More Actions - Toggle deletion mark) if it was created by mistake.
Create a reversal document:
Go to Warehouse - Stocktaking documents - Inventory Receipts.
Click Create to add new one Inventory Receipt document.
Fill in the following:
Entity
Warehouse (to which the item should be returned)
Item and quantity (exactly as written off)
Accounting account, if required
Indicate the reason for return, e.g., “Correction of erroneous write-off”

In the Receipt Reason field, reference the original write-off document (for traceability).
After posting the inventory receipt:
Click “Document Movements” to ensure the item is returned to the warehouse.
Check the inventory balance:
Go to “Reports” → “Inventory Balances and Turnover”.
Verify that the item is available in stock.
Prepare an internal memo or correction act, if required by your accounting policy.
Attach:
A reference or copy of the erroneous write-off document
The newly created inventory receipt document
If integration with 1C:Accounting is enabled, make sure the corresponding entries are correctly reflected in regulatory accounting.
You may need to adjust IFRS data if such reporting is enabled in the system.
If the item was part of procurement requests, budgeting, or contractual obligations — ensure appropriate corrections are made there as well.