Generate Order Release Line Item gid based on client requirement..

Hi,
We know that, by default OTM will generate the Order Release line item id as:
ORDER RELEASE GID-0001.
My requirement is, the Order Release Line Item id should generate like be:
ORDER RELEASE GID-PACKAGED ITEM ID-0001.
Because, in the line item screen, we can give only one Packaged Item. That Item id should come in to the Line Item id value.

I tried with below ways by changing the Order Release line Business Number Generator rule.
{r*:id=1:xml=RELEASE}-{r*:id=2:xml=ITEM}-{nnn:contexts=1:start=1}
{r*:id=1:xml=RELEASE}-{r*:id=2:xml=PACKAGEDITEM}-{nnn:contexts=1:start=1}
{r*:id=1:xml=RELEASE}-{r*:id=2:xml=ITEMMASTER}-{nnn:contexts=1:start=1}

But I haven't succeded.[/COLOR]
Is there any way to solve this problem.Please throw your ideas on this.

Thank you.
Sunny