ACR WAS ISSUED DSCNT THROUGH AN OCCUPIED ALT RESULTING IN LTSS.

Narrative

I WAS PROVIDING OJT TO A RADAR TRAINEE. A WX FRONT WAS PASSING THROUGH OUR SECTOR. ACFT WERE DEVIATING AND REQUESTING LOWER ALT TO AVOID TURB. ACFT A CHKED ON FREQ REQUESTING DEV AND WAS APPROVED. HE WAS AT FL230. LATER ACFT B CHKED ON FREQ. HE WAS LEVEL FL240 WHICH WAS WRONG ALT FOR DIRECTION FOR THE LOA. TRAINEE ISSUED ACFT A CLRNC TO CROSS PIE VORTAC AT FL210. ACFT A DID NOT DSND IMMEDIATELY NOR WAS HE REQUIRED TO DO SO. ACFT B WAS DSNDED TO FL230 TO COMPLY WITH LOA. ACFT A FINISHED DEVIATING AND TURNED INTO ACFT B. CONFLICT ALERT ACTIVATED AND ACFT A WAS DSNDED TO FL210 WITH EXPEDITE. AT THIS POINT I TOOK OVER AND VECTORED BOTH ACFT APART AND REQUESTED ACFT A TO RPT LEAVING FL220. SEPARATION WAS LOST BEFORE REACHING FL220 OR REACHING 5 MI LATERAL. SUPPLEMENTAL INFO FROM ACN 200204: MY ATTN WAS TAKEN FOR SEVERAL MOMENTS BECAUSE OF A COUPLE OTHER TFC SITUATIONS ON THE OTHER SIDE OF THE SCOPE. THE CTLR ON THE ADJACENT SECTOR WAS BEING DIFFICULT ABOUT WORKING WITH ME TO RESOLVE THOSE SITUATIONS. IN THE MEANTIME SEPARATION WAS LOST.