Index: trunk/psModules/src/camera/pmFPACopy.c
===================================================================
--- trunk/psModules/src/camera/pmFPACopy.c	(revision 20633)
+++ trunk/psModules/src/camera/pmFPACopy.c	(revision 20634)
@@ -172,4 +172,6 @@
     int xParityTarget = psMetadataLookupS32(&mdokT, target->concepts, "CELL.XPARITY"); // Target x parity
     assert(mdokS && mdokT);
+    psAssert (abs(xParitySource) == 1, "CELL.XPARITY not set for source");
+    psAssert (abs(xParityTarget) == 1, "CELL.XPARITY not set for target");
     if (abs(xParitySource) != 1) {
         psError(PS_ERR_BAD_PARAMETER_VALUE, true, "CELL.XPARITY is not set for source (%d)",
@@ -189,4 +191,6 @@
     int yParitySource = psMetadataLookupS32(&mdokS, source->concepts, "CELL.YPARITY"); // Source parity
     assert(mdokS && mdokT);
+    psAssert (abs(yParitySource) == 1, "CELL.YPARITY not set for source");
+    psAssert (abs(yParityTarget) == 1, "CELL.YPARITY not set for target");
     if (abs(yParitySource) != 1) {
         psError(PS_ERR_BAD_PARAMETER_VALUE, true, "CELL.YPARITY is not set for source (%d)",
@@ -324,4 +328,6 @@
         int xSize = psMetadataLookupS32(NULL, source->concepts, "CELL.XSIZE"); // CELL.XSIZE of source
 
+	psAssert (abs(xParity) == 1, "CELL.XPARITY not set for source");
+
         if (sourceBin == 0) {
             // Don't know the binning; assume it is unity
@@ -472,6 +478,8 @@
         pmCell *targetCell = pmCellAlloc (targetChip, cellName);
         int xParityTarget = psMetadataLookupS32(&status, sourceCell->concepts, "CELL.XPARITY"); // Target x parity
+	psAssert (abs(xParityTarget) == 1, "CELL.XPARITY not set for target");
         psMetadataAddS32 (targetCell->concepts, PS_LIST_TAIL, "CELL.XPARITY", PS_META_REPLACE, "", xParityTarget);
         int yParityTarget = psMetadataLookupS32(&status, sourceCell->concepts, "CELL.YPARITY"); // Target y parity
+	psAssert (abs(xParityTarget) == 1, "CELL.YPARITY not set for target");
         psMetadataAddS32 (targetCell->concepts, PS_LIST_TAIL, "CELL.YPARITY", PS_META_REPLACE, "", yParityTarget);
         if (!cellCopy(targetCell, sourceCell, true, 1, 1)) {