Order is not going to HD Hold

Team -

We have two customers with are setup Blank Credit Limit and HD Hold Code. However Order is going on HD Hold only for 1st Customer. Other 2nd customer which has similar setup - Order is not going on Hold for same Header business unit , same company and same detail Branch BP.

What we could be missing from our end.

My understanding is that If Customer put on HD - Hold - By default all order will be always go on HOLD if Hold Code Constant is defined. It has nothing to do with Credit Limit Amount.

Thanks,

Kirit