I recently just had problems with bills and some invoices not posting.  This just started and now i have many conflicts that i dont know how to resolve.  Sometimes if i try to resync and push them thru after the conflict it goes.  below are example of 2 conflicts of many:
This is example of invoice that wont post:
QuickBooks returned an error when adding/modifying a accInvoice record. 
 The error was: Object "80000017-1199282837" specified in the request 
cannot be found.  QuickBooks error message: Invalid argument.  The 
specified record does not exist in the list..
The Request was: <?xml version="1.0" encoding="windows-1252" ?>
<?qbxml version="8.0" ?>
<QBXML><QBXMLMsgsRq onError="stopOnError"><InvoiceAddRq 
requestID="qx_1"><InvoiceAdd 
defMacro="TxnID:Invoice1531485312"><CustomerRef><ListID>8000147E-1331064246</ListID></CustomerRef><ARAccountRef><ListID>80000023-1199281052</ListID></ARAccountRef><TxnDate>2012-03-22</TxnDate><IsPending>0</IsPending><SalesRepRef><ListID>80000017-1199282837</ListID></SalesRepRef><IsToBePrinted>1</IsToBePrinted><IsToBeEmailed>1</IsToBeEmailed><InvoiceLineAdd
 
defMacro="TxnLineID:Invoice1125602560"><ItemRef><ListID>800002DB-1274894436</ListID></ItemRef><Desc>(2)
 man Labor rate for Preferred Members only: replace 3 defective rotors. 
cap 2 rotors. repair leaking spray in center 
island.</Desc><Quantity>1.25000</Quantity><Rate>105.00000</Rate><ServiceDate>2012-03-21</ServiceDate></InvoiceLineAdd><InvoiceLineAdd
 
defMacro="TxnLineID:Invoice1873633920"><ItemRef><ListID>80000147-1199282764</ListID></ItemRef><Desc>Hunter/KRAIN
 4' Pop Up Rotor Adjustable w/#6 
Nozzle</Desc><Quantity>3.00000</Quantity><Rate>25.00000</Rate><ServiceDate>2012-03-21</ServiceDate></InvoiceLineAdd></InvoiceAdd></InvoiceAddRq></QBXMLMsgsRq></QBXML>
 
This is example of 1 of many bills that wont post
QuickBooks returned an error when adding/modifying a accBill record.  
The error was: The "billable status" field has an invalid value 
"Billable".  QuickBooks error message: Target is not reimbursable..
The Request was: <?xml version="1.0" encoding="windows-1252" ?>
<?qbxml version="8.0" ?>
<QBXML><QBXMLMsgsRq onError="stopOnError"><BillAddRq 
requestID="qx_1"><BillAdd 
defMacro="TxnID:Bill1028793856"><VendorRef><ListID>80000A52-1199283052</ListID></VendorRef><APAccountRef><ListID>8000004A-1199282715</ListID></APAccountRef><TxnDate>2012-03-09</TxnDate><DueDate>2012-05-08</DueDate><RefNumber>4209907-00</RefNumber><TermsRef><ListID>80000007-1199224272</ListID></TermsRef><ItemLineAdd><ItemRef><ListID>800002CD-1274482144</ListID></ItemRef><Desc>PVC
 PIPE-WSE200. 
75"</Desc><Quantity>400.00000</Quantity><Cost>2.66770</Cost><BillableStatus>Billable</BillableStatus></ItemLineAdd><ItemLineAdd><ItemRef><ListID>800001DA-1199282777</ListID></ItemRef><Desc>PVC
 PIPE - WSSE200 
1"</Desc><Quantity>390.00000</Quantity><Cost>3.55692</Cost><BillableStatus>Billable</BillableStatus></ItemLineAdd><ItemLineAdd><ItemRef><ListID>8000044E-1319483297</ListID></ItemRef><Desc>WIRE:
 12/2 x500' LO 
VOLT</Desc><Quantity>1.00000</Quantity><Cost>147.25999</Cost><BillableStatus>Billable</BillableStatus></ItemLineAdd><ItemLineAdd><ItemRef><ListID>8000025B-1263395448</ListID></ItemRef><Desc>Wire:18/1
 x500' 
Red</Desc><Quantity>4.00000</Quantity><Cost>132.09000</Cost><BillableStatus>Billable</BillableStatus></ItemLineAdd><ItemLineAdd><ItemRef><ListID>8000025C-1263395594</ListID></ItemRef><Desc>wire:18/1
 x500' 
Whit</Desc><Quantity>2.00000</Quantity><Cost>132.09000</Cost><BillableStatus>Billable</BillableStatus></ItemLineAdd><ItemLineAdd><ItemRef><ListID>80000201-1199282779</ListID></ItemRef><Quantity>1.00000</Quantity><Cost>203.64000</Cost><BillableStatus>Billable</BillableStatus></ItemLineAdd></BillAdd></BillAddRq></QBXMLMsgsRq></QBXML>