X4801 Work order creation problem

I have just customized the P4211 program. The customization was related to Transfer orders/ purchase orders. We wanted to have a work order for every line Transfer order line. This doesn’t happen with the standard functionality of delivered by JD-Edwards. It makes only two work orders for first two lines and after that it stops creating work orders. Now I have customized it, that is creates always a work order for every line of the transfer order.

The problem is:

1. I place a order with 4 lines
it creates 4 work orders: fine
2 - I edit the order and add 5 more lines
it creates 4 work orders for last 4 lines: misses 1st line of the last 5 lines added.

I am using:

F4801 Begin Document

F4801 Edit Line

F4801 End Document

On debugging these business functions I get error_code = 2 in event rules after “F4801 Edit Line”.
On debugging in C also get error on these lines of C code:

JDEBFRTN (ID) JDEBFWINAPI F4801EndDocument (………….)
. . . .

if ((lpDS->cProcessEdits != NO_EDITS) && (idReturnCode == ER_SUCCESS))
{
Returns Error here on the following if statement
if (jdeCacheGetNumRecords(dsInternal.hCaches[MAIN_CACHE]) > 0)
{
idReturnCode = IX4801_OpenCursor(&dsInternal, MAIN_CURSOR, MAIN_CACHE);
}
else
{
idReturnCode = ER_ERROR;
}
if (idReturnCode == ER_SUCCESS)
{
idReturnCode = IX4801_DetermineProcessing(lpDS,
&dsInternal,
&dsCache,
&dsWorkCache);
}
}

Please help someone.