When executing a stored procedure in Firebird 1.5 which calls EXECUTE
STATEMENT in order to select from an external table, I get this error:

Dynamic SQL Error
SQL error code = -206
Column unknown
BERGEN_PRICE_FILE_S_TST.DB_KEY
At line 3, column 32.

The field DB_KEY isn't in my procedure. The procedure was created from
an existing procedure which had to be dropped every time the external
file was dropped, thus the attempt to use EXECUTE STATEMENT. In case
the error is with that change, here's the difference between the two
procedures:

FOR EXECUTE STATEMENT 'SELECT
VENDOR_SKU,
LTRIM(UNIT_SIZE),
SIZE_CODE,
LTRIM(STRENGTH_QTY),
STRENGTH_CODE,
ITEM_DESCRIPTION,
CASE_QUANTITY,
PURCHASE_UNITS,
ACQUISITION,
NDDF_PKG_SIZE,
FINELINE,
NDC,
GENERIC_DESCRIPTION,
GENERIC_NUMBER,
THERAPEUTIC_CLASS,
GENERIC_FORM_CODE,
LTRIM(GENERIC_STRENGTH_QUANTITY),
GENERIC_STRENGTH_CODE,
UNIT_DOSE,
FORM_CODE,
CONTRACT_NUMBER,
CONTRACT_START,
CONTRACT_EXPIRE,
CONTRACT_PRICE,
VENDOR_NUMBER,
VENDOR_NAME,
NDDF_AWP,
PACKAGE_SIZE_DIVISOR,
SUPERNET_PRICE_INDICATOR,
AWP,
NDC_UPC_FORMAT_CODE,
RETAIL_PRICE,
SUBSTRING(LTRIM(RECORD_TYPE) FROM 1 FOR 1)
FROM EXTERN_FILE'
INTO
:VENDOR_SKU,
:UNIT_SIZE,
:SIZE_CODE,
:STRENGTH_QTY,
:STRENGTH_CODE,
:ITEM_DESCRIPTION,
:CASE_QUANTITY,
:PURCHASE_UNITS,
:T_ACQUISITION,
:T_NDDF_PKG_SIZE,
:FINELINE,
:NDC,
:GENERIC_DESCRIPTION,
:GENERIC_NUMBER,
:THERAPEUTIC_CLASS,
:GENERIC_FORM_CODE,
:GENERIC_STRENGTH_QUANTITY,
:GENERIC_STRENGTH_CODE,
:UNIT_DOSE,
:FORM_CODE,
:CONTRACT_NUMBER,
:T_CONTRACT_START,
:T_CONTRACT_EXPIRE,
:T_CONTRACT_PRICE,
:VENDOR_NUMBER,
:VENDOR_NAME,
:T_NDDF_AWP,
:T_PACKAGE_SIZE_DIVISOR,
:SUPERNET_PRICE_INDICATOR,
:T_AWP,
:NDC_UPC_FORMAT_CODE,
:T_RETAIL_PRICE,
:RECORD_TYPE
DO BEGIN

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