We are experiencing a recurring issue in SOLIDWORKS PDM Standard 2026 SP2.1.

The error occurs during Check In when the option "Keep Checked Out" is enabled.

Error message:

"Violation of PRIMARY KEY constraint 'PK_HistoryLock'. Cannot insert duplicate key in object 'dbo.HistoryLock'."

Observations:

• The problem occurs on multiple projects and multiple files.
• The issue does not occur during a normal Check In.
• The issue only occurs when using "Check In" together with "Keep Checked Out".
• The problem can be reproduced repeatedly.
• Clearing the local cache does not resolve the issue.
• The issue appears on small assemblies as well as larger projects.
• Other users do not appear to experience the same issue.

Database investigation:

The primary key of the HistoryLock table consists of:

• UserId
• DocId
• Time

The duplicate key reported by SQL Server is typically:

(UserId, DocId, Time)

We investigated the affected Document IDs and found that the error is related to weldment cut-list items.

Example:

• Document ID 2562 = 1000101093.SLDPRT
• Document ID 2564 = "Rör 40x2<1>" (weldment cut-list item)

When checking out the weldment part, PDM automatically includes the cut-list item:

1000101093.SLDPRT
Rör 40x2<1>

HistoryLock entries show that the weldment cut-list item receives multiple lock-history records within only a few milliseconds. For example:

2564 2026-06-24 13:41:03.583
2564 2026-06-24 13:41:03.587

This suggests that PDM may be attempting to create duplicate HistoryLock records during the "Keep Checked Out" operation.

Could you please verify whether this is a known issue in PDM Standard 2026 SP2.1, particularly related to weldment cut-list items and the "Keep Checked Out" functionality?

We can provide additional SQL logs and reproduction steps if required.