You performed wrong update to table definition in SE11, which led to a table conversion in SE14. But the change is not what you want actually.
Table conversion stopped with "Error in step 5" in SE14:
Click "Analyze adjustment", you can find more details:
Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.
NetWeaver ABAP based systems
table conversion, roll back, unlock table, error in step 5, step5, unlock adjustment, SE14, QCM table, QCM8 table, SE11, continue adjustment, reconstruct, adjustement termiated in step 5, CONVT_NO_NUMBER，BCD_FIELD_OVERFLOW, Convert data to new table, delete renamed table, create secondary indexes , KBA , BC-DWB-DIC-AC , ABAP Dictionary Activation and Conversion , How To
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