Quickfix 58=Conditionally Required Field Missing

Question

If I try to replace or cancel an order I get a message 58=Conditionally Required Field Missing and the next message contains 58=Invalid MsgType Here are the logs:

Replacing an order (tgFZctx200U61 is my side. FG is an exchange.):

20170203-15:44:04.225 : 8=FIX.4.49=15135=G34=349=tgFZctx200U6152=20170203-15:44:04.22556=FG1=U6111=270071221=138=240=241=2700744=11640054=155=RTS-3.1760=20170203-18:44:04.20510=028
20170203-15:44:04.225 : 8=FIX.4.49=23235=849=FG56=tgFZctx200U6134=352=20170203-15:43:56.98137=572984433198=F:572984433526=$01$11=270071241=2700717=exec-201702031001027616150=E39=E55=RTS-3.17461=FXXXXX54=138=140=2151=114=06=060=19700101-00:00:00.00010=213
20170203-15:44:04.275 : 8=FIX.4.49=11535=j34=449=tgFZctx200U6152=20170203-15:44:04.27556=FG45=358=Conditionally Required Field Missing372=8380=510=065
20170203-15:44:04.275 : 8=FIX.4.49=33335=849=FG56=tgFZctx200U6134=452=20170203-15:43:56.98237=572984753198=F:572984753526=$01$11=270071241=27007453=1448=tgFZctx200U61447=C452=317=3355471052150=539=01=FZ00U6155=RTS-3.1754=138=240=244=116400.00000336=9291151=214=06=060=20170203-15:43:56.98920008=-922337203685372211120018=[51000-3355471052-0]10=100
20170203-15:44:04.285 : 8=FIX.4.49=10335=349=FG56=tgFZctx200U6134=552=20170203-15:43:57.03345=4371=372373=1158=Invalid MsgType372=810=164

cancelling an order:

20170203-15:26:19.178 : 8=FIX.4.49=15435=F34=349=tgFZctx200U6152=20170203-15:26:19.17856=FG11=270061237=57286383038=141=2700644=116470.0000054=155=RTS-3.1760=20170203-18:26:19.17810=013
20170203-15:26:19.188 : 8=FIX.4.49=20735=849=FG56=tgFZctx200U6134=352=20170203-15:26:11.92437=572863830198=F:572863830526=$01$11=270061241=2700617=exec-201702031001027615150=639=655=RTS-3.17461=FXXXXX54=138=140=2151=114=06=010=239
20170203-15:26:19.418 : 8=FIX.4.49=11535=j34=449=tgFZctx200U6152=20170203-15:26:19.41856=FG45=358=Conditionally Required Field Missing372=8380=510=070
20170203-15:26:19.418 : 8=FIX.4.49=33335=849=FG56=tgFZctx200U6134=452=20170203-15:26:11.92437=572863830198=F:572863830526=$01$11=270061241=27006453=1448=tgFZctx200U61447=C452=317=3354681208150=439=41=FZ00U6155=RTS-3.1754=138=140=244=116470.00000336=9291151=014=06=060=20170203-15:26:11.93120008=-922337203685267353520018=[51000-3354681208-0]10=080
20170203-15:26:19.418 : 8=FIX.4.49=10335=349=FG56=tgFZctx200U6134=552=20170203-15:26:12.16445=4371=372373=1158=Invalid MsgType372=810=161

Best regards, Mikhail

Answer 1

"Conditionally Required Field Missing" means you are trying to extract an optional field that isn't present. (It's not required by the DD, but the user's logic expects it to be there, hence "conditionally required".)

The first 35=j message says:

• 45=3 - sequence number of message where these happened
• 58=Conditionally Required Field Missing
• 372=8 - type of message where this happened
• 380=5 - same code as explained in 58

Unfortunately, the message doesn't say which field is the problem, but basically, you're doing this (forgive my pseudocode):

var x = msg.getSomeOptionalField()

but you need to do this:

var x = null;
if (msg.checkIfSomeOptionalFieldIsPresent())
    x = msg.getSomeOptionalField();