ISUP Called Party Number length issue after prefix removal

Hi,

I have a SIP-I scenario where the core sends calls with ISUP encapsulated and the Called Party Number includes a prefix.

On the SBC, I remove this prefix using a translation rule.
After that, the ISUP Called Party Number “Parameter Length” becomes incorrect, even though the digits are correct.

Has anyone seen this before?
How can I make the SBC recalculate or fix the ISUP parameter length after removing the prefix?

Thanks.