Setting query datasource at runtime for FORM Datablock

Question

Hello all,
we have below requirement -
the Form datablock is build on a customized table. we need to populate some of the fields of the form by writing a view which joins tables across variousl modules. the form data will be queried by giving po number in query find window. then the rest of the fields are entered from the form front end and saved to the DB Table. we want to query the new po numbers from the view from the query find window. where as the existing po numbers will be queried from the form datablock table only... for this i wrote the below pre_query trigger at datablock level.
declare
     po_num number;
BEGIN
:parameter.G_query_find := 'TRUE' ;
select count(*) into po_num from ICS_PO_IBOT_ICOT_REP where vendor_po_num = nvl(:QUERY_FIND.PO_NUMBER, vendor_po_num);
     if po_num > 0 then
COPY(:QUERY_FIND.PO_NUMBER, 'ICS_PO_IBOT_ICOT_REP.VENDOR_PO_NUM');
     else
set_block_property ('ICS_PO_IBOT_ICOT_REP', QUERY_DATA_SOURCE_NAME, '(select * from ICS_PO_IBOT_ICOT_REP_VIEW where
VENDOR_PO_NUM = :QUERY_FIND.PO_NUMBER)');
end if;
:parameter.G_query_find := 'FALSE';
end;
here ICS_PO_IBOT_ICOT_REP - DB TABLE
ICS_PO_IBOT_ICOT_REP_VIEW - view
condition is checking for existing pos in table.....
The above form while running from oracle apps, entering a New po number in query find window gives following error -
ORA-01008: not all variables are bound.
whereas for old pos it works correctly......................Please help on this...
on more analysis from help-diagnostic-system - last query it gives the below code
SELECT LAST_UPDATE_DATE,LAST_UPDATED_BY,LAST_UPDATE_LOGIN,CREATION_DATE,CREATED_BY,ATTRIBUTE1,ATTRIBUTE2,ATTRIBUTE3,ATTRIBUTE4,ATTRIBUTE5,ATTRIBUTE6,ATTRIBUTE7,ATTRIBUTE8,ATTRIBUTE9,ATTRIBUTE10,ATTRIBUTE11,ATTRIBUTE12,ATTRIBUTE13,ATTRIBUTE14,ATTRIBUTE15,ATTRIBUTE16,ATTRIBUTE17,ATTRIBUTE18,ATTRIBUTE19,ATTRIBUTE20,ATTRIBUTE21,ATTRIBUTE22,ATTRIBUTE23,ATTRIBUTE24,ATTRIBUTE25,ATTRIBUTE26,ATTRIBUTE27,ATTRIBUTE28,ATTRIBUTE29,ATTRIBUTE30,ORG_ID,CONSULTANT_ID,CONSULTANT_NAME,VENDOR_NAME,VENDOR_CONTACT_NUM,VENDOR_EMAIL,VENDOR_DIVERSITY_STATUS,CONSULTANT_INFO,MINORITY_STATUS,REMARK,CBC_DATE,ACKN_DATE,IBM_PO,PO_STATUS,SOW_NUMBER,PO_TYPE,START_DATE_ON_PO,IBM_PO_ISSUE_DT,IBM_PO_ICS_RCV_DT,IBM_PO_CHANGE_DT,SKILL_LEVEL,REQUESTER,REQ_CONT_NO,REQ_EMAIL_ID,BUYER,BUYER_CONT_NO,BUYER_EMAIL_ID,TRANS_STATUS,ST_BILL_RATE,ST_HOURS,OT_BILL_RATE,OT_HOURS,EXPENSES,TOTAL,REGION,AREA,LOCATION,STATE,JOB_ROLE,JOB_SKILL,LOB,CSA_REQ_NO,CSA_SUBMIT_DT,CLIENT,WAGES,EXEMPT,BENEFIT_STATUS,US_NATIONAL,VISA_STATUS,MATRIX_PRICE,SCORP_C2C_W2H,REFERAL_STATUS,REBATE_STATUS,REBATE_PERCENTAGE,REBATE_DESC,CSA_FEE_STATUS,CSA_PERCENTAGE,ICS_FEE,MARK_UP,ADD_INFO,VENDOR_PO_NUM,CCF_CREATED_DATE,CCF_MODIFIED_DATE,DOJ,DOT,DATE_OF_MODIFICATION_DOT,ST_PAY_RATE,ST_BURDEN_RATE,OT_PAY_RATE,OT_BURDEN_RATE,RATE_DESC,SALES_PERSON,RECRUITER,PROJECT,ACCRUAL_REVERSAL,WEEK_1,WEEK_2,WEEK_3,WEEK_4,WEEK_5,ESTIMATE,ACCRUALS,TOTAL_HOURS,BILLABLE_AMOUNT,TOTAL_COST,GM_AMOUNT,GM_PERCENTAGE,INVOICE_NUMBER,INVOICE_AMOUNT,SUBMITTED_ON,RENEWAL_PO,REJECTED_ON,RESUBMITTED_ON FROM (select * from ICS_PO_IBOT_ICOT_REP_VIEW where
VENDOR_PO_NUM = :QUERY_FIND.PO_NUMBER)
please suggest what am i missing?????????????????????
Thanks,
Sam

Answer 1

here are the answers to your questions-
How do you update record?
Do you have any ON-UPDATE, POST-UPDATE, PRE-UPDATE triggers on this block?
Do you have any database triggers on the table?
What is DML Data Target Type property of this block?
it was not required for me to write any ON-UPDATE, POST-UPDATE, PRE-UPDATE triggers on this block to update record. these are done or taken care off automatically. no database trigger is associated with the table. DML data target type is table.
also the block has Query data source type as Table only. and the query data source name is the db table ie ICS_PO_IBOT_ICOT_REP. so what u suggest now? if i simply click on new button and enter some data onto form and save it it is inserting record onto db table. so why cant it insert the record in current scenario when a new PO is queried from the view. Please help on this where i am missing.................