Heparin Drip Compatibilty

So today pt pt was ordered a Heparin drip and IV abx. One abx was Vanco - which is not compatible with heparin - the other abx was Azactam (sp?). When I looked its compatibility with Heparin up it said it was compatible at the Y-site. I ran the Abx on its own pump and connected it to the Y-site on the Heparin line

I called pharmacy just to double check. they agreed. Then, another RN with many more yrs experience than I, (been an RN for 6 mos) said that NOTHING is to run with heparin- "Per hospital policy"

I looked up our policy and it said verbatim, "It is not recommended" but Heparin was NOT included in the list of meds that had to be run by themselves.

What do u think about this? was I wrong to run the abx and heparin?

Just wondering