Hi

what version you use?

InsertLines never worked for me, Use Modify or save and populate the lines like

<LIN NUM="1">

<FLD NAME="FLD1">VAL1</FLD>

<FLD NAME="FLD2">VAL11</FLD>
</LIN>
<LIN NUM="2">

<FLD NAME="FLD1">VAL2</FLD>

<FLD NAME="FLD2">VAL22</FLD>
</LIN>

etc...

for deleteLines

c# example

wWsvc =web service client

wCtx = web service context

aPublicIdentifier = x3 web service publication name

aParamsKeyValue = the params for the web service for example: SOHNUM for SOH

{
CAdxParamKeyValue[] paramsKeyValues = new CAdxParamKeyValue[1];
paramsKeyValues[0] = new CAdxParamKeyValue();
paramsKeyValues[0].key = "SOHNUM";
paramsKeyValues[0].value = "123456789";
return paramsKeyValues;
}

aBlockKey = grid screen~grid variable , for example: "SOH4~NBLIG"

aLINToDelete = line on grid to delete, you need to know the line # on the grid. if you read the object LIN is what you are looking for.
you can't delete more than 1 line at a time as once you delete a line all the other lines get a new LIN....
so in general it is not the most useful function...

string[] lineKeys = new string[1]; 
lineKeys[0] = System.Convert.ToString(LINE_TO_DELETE);

CAdxResultXml  wResult = wWsvc.deleteLines(wCtx, aPublicIdentifier, aParamsKeyValue, aBlockKey, aLINToDelete);

hope this helps