SAP Message /LIMEB/UTIL007 - Structure &1 is adjusted and partially activated. Conversion required

Diagnosis
Due to usage in tables, the affected tables must be converted afterdeleting fields from this structure. Direct activation of the modifiedstructure may not be possible under the circumstances.

System Response
The affected objects are converted.
Table /LIME/PN_ITEM must be converted.

Procedure
Tables can be converted in transaction SE14. Make sure that the 'Savedata' button has been selected.