Alpha conversion not possible for Infoobject

Hi,

I had the issue to change the length of an IO with ALPHA-conversion from length 4 to 6. Data type is NUMC.

As proposed by the system I disabled ALPHA, changed the length and used transaction RSMDEXITON to switch on ALPHA conversion again. This worked fine so far.

But for an other IO, that is compounding to the first one, the ALPHA conversion was 'deleted' and can not be switched on again.

I don't want to use the transaction RSMDEXITON again, as it was locking objects all over the system and I will run into trouble using it in the productive system.

Is there an other way to switch on ALPHA conversion again?

We are currently working with SAP BW 3.0B SP24.

Thanks in advance

Steve