Proportion out of balance on consolidated level

Summary:

At one of our customers we have the issue that proportion is out of balance, showing a balance sheet mismatch on consolidated level on ownership change (from 0 to 100% owned)

This happens on an IC relationship between two entities under the same parent (BA15000IC versus BL15010IC with Plug BL15010P). The amount on the plug account for the entry on the entity that becomes the Holding, the proportion amount gets doubled on FCCS_Mvmts_Acquisitions in the period after ownership change.

Has anyone seen this behavior before?

Content (please ensure you mask any confidential information):

On the right you see the yellow amount in SEP-FY22 (before ownership change).